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COATING TECHNIQUES - Coggle Diagram

- - - - Robust technique for coating glass and plastic sheets with
        uniform, thin films
      - PRINCIPLE
        (i) Pull the substrate from the solution of the coating material after it is immersed in the solution for a while
        (ii) A thin layer of the solution is coated on the substrate surface
        (iii) After the solvent evaporates, a thin layer of the polymer forms
    - - To apply on the surface a controlled liquid
        thickness
    - - To apply liquid paint
        onto aluminium, steel
        and other materials.
    - - :pencil2:Applied to substrate suspended vertically
        whereby the coating materials flow via gravity :pencil2: is ideal for coating items with complex geometrical structures
      - PRINCIPLE
        :check: Spraying a substrate with excessive amounts of lacquer or paints, or applying streams of coating materials to it
        :check: The excess coating materials drip off and then are collected, filtered and automatically reintroduced to the lacquering system
        :check: High application performance (~90%) as compare to spraying
        :check:Low viscosity coating is usually used
      - ADVANTAGES
        :fire:dust particles can be swept away
        :fire:saving of coating materials
        :fire:can be applied to just one side
- - - - MECHANISM
        -Hydrogen evolution at cathode decreased the concentration of H+ in bath
        -Caused the hydrolyzing equilibrium for manganese dihydro phosphate to move towards insoluble phosphate generation
    - - ADVANTAGES
        (a) Cost Competitive
        (b) Dimensional Stability
        (c)Corrosion Resistance
        (d)Appearance
- - - - :pen:Coating materials move into spray nozzle by gas flowing or gravity
        :pen:The materials are sprayed by oxyacetylene flame that is partially
        melted and fused to metal substrate surface
        :pen:Particle velocity is low
    - - :pen:Some quantity of materials are exploded at rate between 4 – 8 times/second.
        :pen:Coating materials gas is produced at high velocity and hit the substrate
        :pen:Hitting substrate will produce strongly bonded coating.
    - - :pen:Gas flame of oxyacetylene melt the rod
        :pen:Melting material spray on to substrate at high speed
    - - :pen:Arc is formed between two wires. The molten ends of the wire are dispersed and accelerated by a gas stream
        :pen:The temperature reaches to 5000 °C, Particle velocity lies in range of 100 – 300 m/s
        :pen:Potential coating materials must have certain electrical conductivity and ductile to produce as wire
    - - **An inert gas or gas mixture ionized between two electrodes
        MECHANISMS
        Powder particles are injected into hot plasma and thereby melted and hit the surface of the component at high speeds
  - - - :pencil2:Usually used in inaccessible areas or where it is
        necessary to produce a very heavy coating in one application
        :pencil2:Coating plague is provided by mixing the coating material with
        binder
        :pencil2:Coating plague is troweling onto the surface
        and cool it
    - - :pencil2:Substrate preparation by chemical cleaning and sand paper grinding
        :pencil2:Spray the coating on to the substrate surface
        :pencil2:Water is added for better spraying process
        :pencil2:Heat the object for strong binding coating.
        :pencil2:Fine-grinding the ceramic material.
        :pencil2:Thickness of 1-250 mils are obtainable
- - - - :red_flag:Evaporation relies on thermal energy supplied to the crucible or boat
        :red_flag:Electrical beam can be used as source of heat
        :red_flag:Source materials melts and vaporizes which is then deposited on the substrate placed directly above