Describe metal spraying process for protection of metal from corrosion .Write its two applications.

Describe metal spraying process for protection of metal from corrosion .Write its two applications.
by

1 Answer

Answer :

Process:-

i) In this method, coating metal sprayed on the surface of base metal with the help of spraying gun or pistol.

ii) The spraying gun consist of a duct for compressed air and is fitted with the oxy- hydrogen flame.

iii) The coating metal in the form of wire is fed into the gun which is then melted inside the gun with the help of oxy hydrogen flame.

iv) The molten metal then sprayed on the surface of base metal with the help of compressed air.

Applications:

1) Can be applied to non metallic bases made of wood plastic and glass.

2) Coating can be applied to fabricated structure.

3) Worn-out out machine parts can be reclaimed.

4) Coating of metals like Al, Zn, Ni, Sn, Pb etc. is made by the method of spraying.
by

Related questions

Write the mechanism of corrosion of metal due to action of oxygen.

Description : Write the mechanism of corrosion of metal due to action of oxygen.

Last Answer : Mechanism: Metallic surfaces when exposed to air undergo oxidation and the process of corrosion is represented by the equation.   A thin oxide layer is formed on the metal surface and the nature of this film decides further action depending upon the film so produced.   

Write the different types of oxide films formed on the metal surface. Explain the oxide film which is more protective against corrosion.

Description : Write the different types of oxide films formed on the metal surface. Explain the oxide film which is more protective against corrosion.

Last Answer : Types of oxide films 1. Stable porous oxide film 2. Stable non porous oxide film 3. Unstable oxide film 4. Volatile oxide film i) Stable nonporous oxide film ii) Unstable oxide films are protective ... . Example: - Such type of oxide film is formed in the metals like Ag, Au, and Pt.

Describe the tinning process. Write its two applications.

Description : Describe the tinning process. Write its two applications.

Last Answer : Tinning: -The process of covering iron or steel sheets with a thin coat of tin to prevent it from rusting is called as tinning.   Process: i) The sheet of steel to be ... Tinned copper sheets are used for cooking utensils and refrigeration equipment. Cu tubes are used in refrigeration. 

Write two applications and two properties of Rose metal.

Description : Write two applications and two properties of Rose metal.

Last Answer : Properties: 1. It is easily fusible alloy. 2. It’s melting point is 89 0C. Applications: 1. It is used for making fire – alarms, fuses wires. 2. It is used for casting dental works 3. It is used in automatic sprinkler system.

Describe the hydrogen evolution mechanism of immersed corrosion

Description : Describe the hydrogen evolution mechanism of immersed corrosion

Last Answer : Steel tank: - Anode Cu - strip:- Cathode These types of corrosion occur usually in acidic environments, like industrial waste, solutions of non - oxidizing acids (like HCl). Process: A ... steel tank in contact with copper is corroded most with the evolution of hydrogen gas. 

Define atmospheric corrosion. Write mechanism of atmospheric corrosion with diagram.

Description : Define atmospheric corrosion. Write mechanism of atmospheric corrosion with diagram.

Last Answer : Atmospheric corrosion: This type of corrosion occurs when metal surface comes in immediate contact directly with atmospheric gases like O2, Cl2, Br2, I2, H2S, CO2, SO2, NO2 etc.

Write any two examples of sacrificial anodic protection.

Description : Write any two examples of sacrificial anodic protection.

Last Answer : Examples: 1) To protect buried water or gas pipelines. 2) To protect buried cables. 3) To protect hot water tank, etc. 4) Mg or Zn rods are bolted along the sides of ship, hot water ... protect open water box coolers. 6) To protect water tanks. 7) To protect transmission line towers, etc. 

Write two application of metal cladding process.

Description : Write two application of metal cladding process.

Last Answer : Applications : 1) Al clad sheets used in aircraft industry in which a plate of duralumin is sandwiched between two layers of 99.5% pure Al. 2) Cu clad steel wire is obtained by ... cu-tube is used for electrical conductors possessing combining strength of steel with the high conductivity of Cu.

Define immersed corrosion.

Description : Define immersed corrosion.

Last Answer : Definition: The corrosion which is brought about through ionic reactions in the presence of moisture or solution as a conducting medium when two dissimilar metals are in contact with each other is called electro chemical corrosion. 

Define electrochemical corrosion.

Description : Define electrochemical corrosion.

Last Answer : Electrochemical corrosion:- The corrosion which is brought about through ionic reactions in the presence of moisture or solution as a conducting medium when two dissimilar metals are in contact with each other is called electro chemical corrosion. 

Which oxide film is most protective against corrosion? Why?

Description : Which oxide film is most protective against corrosion? Why?

Last Answer : Non-porous stable oxide film is most protective oxide film. This oxide film is extremely adherent and non-porous (protective). Due to the absence of pores or cracks in the oxide film, it forms barrier for further action and therefore, the rate of corrosion of metal decreases rapidly. 

Define Atmospheric corrosion. State the factors affecting rate of atmospheric corrosion.

Description : Define Atmospheric corrosion. State the factors affecting rate of atmospheric corrosion. 

Last Answer : Atmospheric corrosion: This type of corrosion occurs when metal surface comes in immediate contact directly with atmospheric gases like O2, Cl2, Br2, I2, H2S, CO2, SO2, NO2 etc.  Factors affecting rate of atmospheric corrosion:- 1) Impurities in the atmosphere. 2) Moisture in the atmosphere. 

State the factors affecting immersed corrosion.

Description : State the factors affecting immersed corrosion.

Last Answer : i) Position of metal in electrochemical series. ii) Purity of metal iii) Nature of the oxide film. iv) Solubility of corrosion products. v) Physical state of the metal vi) ... viii) Humidity ix) Temperature x) Differential aeration xi) Environmental impurities xii)Conductance of medium.

Explain four factors affecting rate of immersed corrosion.

Description : Explain four factors affecting rate of immersed corrosion. 

Last Answer : A) Nature of metal: 1) Position of metal in a galvanic series: A metal having higher position in a galvanic series has more chemical reactivity and therefore, it gets attacked by gaseous ... conducting medium and promotes corrosion. e.g. Rusting of Fe is promoted in humid atmosphere.  

Write two applications of copper.

Description : Write two applications of copper.

Last Answer : 1) For making electrical wires, cables and conducting apparatus. 2) As a coinage metal and in ornaments, jewelry for making them hard. 3) For making water stills, kettles, vacuum pans, steam pipes ... such as hypsometers, colorimeters, etc. 7) For making alloys like brass, bronze, gun metal, etc.

Write any two applications of silicon fluid.

Description : Write any two applications of silicon fluid. 

Last Answer : Applications:- 1) As a lubricant: excellent lubrication for plastic and elastomeric surfaces. 2)In polishes and chemical specialities: It is used in automobile and furniture polishes due to its high ... ,non-toxic , non-carbonizing moulds release for rubber, plastics and metal die castings. 

Write two applications of Teflon

Description : Write two applications of Teflon

Last Answer : Applications of Teflon: i) Teflon used as capacitor dielectrics & insulating material for all kinds of windings. ii) Heat resistant materials are prepared by combining Teflon with glass cloth. iii ... . vii) Teflon coating is applied on vehicle to protect them from corrosion and scratches. 

Write two applications of aluminum

Description : Write two applications of aluminum

Last Answer : 1) For preparing utensils, surgical instruments, heating appliances, parts of aeroplanes, containers for chemical industry etc. 2) For making electric wires and cables for transmission lines. 3) ... storing nitric acid. 13) As refractory for lining of furnace and for making refractory bricks.

Write the properties and applications of epoxy resin.

Description : Write the properties and applications of epoxy resin.

Last Answer : Properties: i) They have good chemical resistance. ii) They have low shrinkage during curing. iii) They possess good electrical resistance. iv) These compounds can be used in solid and ... to their electrical resistance they are widely used in making insulators, bushings etc. for high voltage. 

Write four properties and four applications of urea formaldehyde resin.

Description : Write four properties and four applications of urea formaldehyde resin.

Last Answer : Properties: 1) The bond film produced by Urea - Formaldehyde resin is quite rigid & transparent. 2) It is good resistant to moisture, insects & fungi. 3) However action of acids & alkalies ... 3) Used as bonding articles in aircraft. 4) Used as bonding articles in ship building industries etc.

What are applications of sherardizing process?

Description : What are applications of sherardizing process?

Last Answer : Applications:- i)Sherardizing is used especially for protecting small odd shaped steel articles like bolts, screws, nuts, threaded parts washers, valves, gauge, tools etc.against atmospheric corrosion. ... has crevices or depression and there is practically no change in the dimensions of articles.

Write the action of Conc. HNO3 on Aluminium metal.

Description : Write the action of Conc. HNO3 on Aluminium metal.

Last Answer : Aluminum metal does not react with dilute as well as concentrated Nitric acid.

Explain cathodic protection. Give one example.

Description : Explain cathodic protection. Give one example.

Last Answer : Cathodic protection: It is the method in which the metal to be protected is forced to behave as a cathode. Examples: 1) To protect buried water or gas pipelines. 2) To protect buried cables. 3) ... water box coolers. 6) To protect water tanks. 7) To protect transmission line towers, etc.  

Define photo conductive polymer. Give its examples and applications.

Description : Define photo conductive polymer. Give its examples and applications.

Last Answer : Photo conductive polymer: These are the polymers which conduct electricity only in the presence of light. Examples: i) PVK or poly(N-vinyl carbazole ) ii) Poly (vinylpyrene),iii) poly(2- ... resistors are often used include camera light meters, street lights, clock radios and infrared detectors.  

State two applications of lead acid storage cell.

Description : State two applications of lead acid storage cell.

Last Answer : Applications of lead acid storage cell: 1. Lead acid storage cellis commonly used in automobiles. 2. To Supply current for electric vehicles 3. In Gas engine ignition 4. In telephone exchanges ... hospitals 7. In broad casting stations, power stations 8. For distribution work 9. In inverters

Give the applications of phenol formaldehyde resin.

Description : Give the applications of phenol formaldehyde resin.

Last Answer : 1) For making electric insulator parts like switches, plugs, switchboards, heater-hands, sockets for light bulb, etc. and in wire insulation. 2) Used for making moulded articles like telephone parts, ... ) In paints and varnishes. 7) It is used as hydrogen- exchanger resin in water softening.

State composition, properties and applications of Tinmann’s solder

Description : State composition, properties and applications of Tinmann’s solder

Last Answer : Composition, properties and applications of Tinmann’s solder :

Describe galvanizing process with suitable diagram.

Description : Describe galvanizing process with suitable diagram.

Last Answer : It is the process of coating iron or steel sheets with a thin coat of zinc to prevent it from rusting. Process: The iron or steel sheet to be galvanized is first cleaned with dilute ... rollers to remove excess zinc and in order to get uniform coating. Finally it is annealed at 6500C. 

Describe Bessemerisation process with the help of chemical reaction & diagram.

Description : Describe Bessemerisation process with the help of chemical reaction & diagram. 

Last Answer : After smelting the molten matte is then transferred to a Bessemer converter which is a pear shaped furnace made up of steel and internally lined with lime or magnesia. It is mounted on trunnions and can be ... surface of copper hence it is called as blister copper. It is 96 to 98% pure.  

Describe Bessemerization process with neat labeled diagram

Description : Describe Bessemerization process with neat labeled diagram 

Last Answer : After smelting the molten matte is then transferred to a Bessemer converter which is a pear shaped furnace made up of steel and internally lined with lime or magnesia. It is mounted on trunnions and can ... on the surface of copper hence it is called as blister copper. It is 96 to 98% pure

Describe the process of purification of aluminium by electrolytic refining with the help of neat, labelled diagram.

Description : Describe the process of purification of aluminium by electrolytic refining with the help of neat, labelled diagram.

Last Answer : Process: 1) The electrolytic cell consists of an iron tank lined at the bottom with carbon, which serve as anode. A number of graphite rods serve as cathode. 2) The cell is filled with ... . Crude or impure Al is added to the bottom layer from time to time. The process is thus continued.

Describe smelting process with neat labeled diagram.

Description : Describe smelting process with neat labeled diagram.

Last Answer : Roasted copper ore is then mixed with coke & sand particles & then strongly heated at about 13500 C in a water jacketed blast furnace. At high temperature ferrous sulphide (FeS) is oxidised & ... of ferrous sulphide (FeS) is called as matte which is then removed from the lower outlet.

Write two points of similarity between sherardizing and galvanising process.

Description : Write two points of similarity between sherardizing and galvanising process.

Last Answer : 1) Sherardizing and galvanizing are the processes of avoiding corrosion of metal. 2) Zinc is used as coating metal on iron base metal.

Give the composition of rose metal and its one application.

Description : Give the composition of rose metal and its one application.

Last Answer : Composition: Bi = 50%  Pb = 28%  Sn = 22% Applications:- 1.It is used for making fire alarms. 2.It is used in electrical fuse wires. 3.It is used for casting for dental works. 4.It is used in automatic sprinkler system.

State the composition of Rose metal.

Description : State the composition of Rose metal.

Last Answer : Composition: Bi = 50%  Pb = 28%  Sn = 22%

Why metal cladding is done on plane surfaces only?

Description : Why metal cladding is done on plane surfaces only?

Last Answer : The process of metal cladding involves bonding firmly and permanently, a dense homogenous layer of a coating metal to the base metal on one or both sides. In this process base metal is sandwiched or ... cell action in presence of moisture. Hence the metal cladding can be done only on plain surfaces.

Describe electrolytic reduction of alumina.

Description : Describe electrolytic reduction of alumina.

Last Answer : i) Aluminium is extracted from alumina by electrolysis of mixture of alumina (20%) , Cryolite (60%) & Calcium fluoride (20%). Addition of cryolite& fluorspar not only makes alumina a ... set free at the cathode is removed periodically in the molten condition from bottom of the cell.

Define cementation. Describe sherardizing with help of neat labeled diagram

Description : Define cementation. Describe sherardizing with help of neat labeled diagram

Last Answer : Cementation: Cementation is the process in which metal coatings are obtained by heating the base metal in a revolving drum containing a powder of the coating metal.   Process: i) The iron articles ... iron forming Fe - Zn alloy at the surface which protects iron surface from corrosion.   

Describe construction and working of H2-O2 fuel cell.

Description : Describe construction and working of H2-O2 fuel cell.

Last Answer : Construction :- )One of the simplest & most successful fuel cell is hydrogen oxygen fuel cell. ii) It consists essentially of an electrolytic solution such as 25% KOH or NaOH ... . Hydrogen & oxygen gases are bubbled through the anode & cathode compartment respectively.

Describe construction and working of Daniel cell.

Description : Describe construction and working of Daniel cell.

Last Answer : Answer : Construction: It consists of zinc electrode dipped in ZnSO4 Solution & Copper electrode dipped in CuSO4 solution. The two solutions are separated by a porous pot. The two solutions can seep ... as Cu & hence copper electrode becomes positively charged. The emf of cell is 1.1 volt.

Describe construction and working of dry cell.

Description : Describe construction and working of dry cell.

Last Answer : Construction: It consists of zinc container (vessel) which acts as an anode. Cathode is a Graphite rod. It acts as inert electrode. The Graphite rod is surrounded by a paste of MnO2 (Manganese dioxide) ... Working At zinc anode: - Dissolution of zinc electrode to form zinc ions

Describe construction and working of hydrogen oxygen fuel cell.

Description : Describe construction and working of hydrogen oxygen fuel cell.

Last Answer : Construction:- 1. It consists essentially of an electrolytic solution such as 25% KOH or NaOH solution, & two inert porous electrodes (like porous carbon) containing suitable catalyst. ... & oxygen gases are bubbled through the anode & cathode compartment respectively.

Define specific conductance. Write its unit.

Description : Define specific conductance. Write its unit.

Last Answer : Specific conductance is the conductance offered by 1 cm3 of the substance or 1ml solution.  OR The conductance offered by a solution or a conducting material having unit length & unit area of cross ... conductance. Unit of specific conductance: ohm-1 cm-1 or mhos-cm-1 or S.cm-1

Define the term equivalent conductance. Write its unit

Description : Define the term equivalent conductance. Write its unit

Last Answer : Equivalent conductance (λv): It is the conductance of the solution containing 1 gm equivalent of solute / electrolyte when placed between two sufficiently large electrodes 1 cm apart. Unit: ohm-1 cm2 / equivalent OR mhos.cm2 /equivalent 

Write two properties and two uses of Bakelite.

Description : Write two properties and two uses of Bakelite.

Last Answer : Properties Uses Hard,Rigid,strong,scratch resistant & brittle material. insulation of electrical wires & cables electrical switches, switch board sockets, plugs for ... Rolling mills, Decorative laminates wall covering & industrial laminates for electrical parts. 

Write two characteristics and two uses of Ni-Cd battery.

Description : Write two characteristics and two uses of Ni-Cd battery.

Last Answer : Characteristics: 1. The e.m.f. of cell is 1.4 V when fully charged. 2. It has low internal resistance & longer life span (5 years). 3. It is expensive in cost. 4. It can be ... lighting and air conditioning because of its long life & low maintenance cost. 3. It is widely used in calculators.

Define adhesive. Write two characteristics of Adhesive.

Description : Define adhesive. Write two characteristics of Adhesive.

Last Answer : Adhesives- Any substance which is capable of holding the materials together by surface attachment is called as an adhesive Characteristics:-  i) Adhesive should form rigid, strong and durable bond. ii ... the adhesion property on storage. v) It should be resistant to heat, chemicals and water.  

Write any two advantages of Adhesives.

Description : Write any two advantages of Adhesives.

Last Answer : i) Adhesives have an advantage of joining material such as glass & metal, metal metal, metal & plastic, plastics-plastic, ceramic & ceramic. ii) Surfaces are easily & rapidly attached to each ... are leak proof for gases & liquids. So adhesive bonding is used in preparing water tight wood boats

Write the action of Nitric acid on Aluminium.

Description : Write the action of Nitric acid on Aluminium.

Last Answer : Aluminium metal does not react with dilute as well as concentrated Nitric acid 

Write the action of water on Aluminium.

Description : Write the action of water on Aluminium.

Last Answer : Pure aluminium is not affected by pure water. However, impure aluminium is readily corroded by water containing salts (seawater). It decomposes boiling water with evolution of hydrogen.