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Surface Treatment Processes and Coatings

Surface Treatment Processes and Coatings. Chapter 17. Phosphate Conversion Process. Phosphoric acid treatment Ferrous Phosphate coating is rust resistant. Chromate Conversion Process. Coating provides Corrosion resistance Good electrical conductivity Good appearance.

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Surface Treatment Processes and Coatings

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  1. Surface TreatmentProcesses and Coatings Chapter 17

  2. Phosphate Conversion Process • Phosphoric acid treatment • Ferrous Phosphate coating is rust resistant

  3. Chromate Conversion Process • Coating provides • Corrosion resistance • Good electrical conductivity • Good appearance

  4. Oxide Conversion Processes • Anodizing process • Part to be coated is the anode • Acid used as electrolyte • Coating does not add to the dimensions • Anodizing is widely used • Aluminum • Magnesium • Zinc • Galvanized surfaces

  5. Cyanide Conversion Process • Blued Steel • Ferric Ferro cyanide • Heat to 600 degrees F in air • Hot bluing • Molten solution of sodium nitrate and potassium nitrate • Cold bluing • Coating with ammonium polysulfide

  6. Inorganic Coatings • Metal • Metallizng • Electroplating • Dipping • Ceramic • Porcelain • Refractories

  7. Organic Coatings • Oil paints • Alkyd paints • Epoxy paints • Silicone paints • Varnishes and enamels • Latex paints • Casein paints

  8. Brushing Rolling Dipping Electrocoating Spray painting Printing Curtain coating Powder coating Heat transfer coating Organic Coating Processes

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