What is a conversion coating?
Conversion coating is a metal surface treatment that offers decoration, corrosion and resistance of wear or receptive layer for colors, dyes, lubricants or adhesives. These coatings are achieved by chemical or electrochemical processes that physically convert the metal surface components to the desired surface. The most common of these conversion processes are oxide, phosphate and chromate. Oxide conversions are used on various metals such as decorative and corrosion finishes and include Bluing, black oxide and anodized treatment. Conversions of phosphate and chromat offer more specialized finishes, improve wear resistance and serve as conductive elements, primers for colors and adhesives or layers of lubricant tank.
Metal parts are often treated with processes increasing surface or change to improve the appearance or work characteristics of metal. Family conversion family is a widely used example of this type of process and can be applied to a number of metals including steel, copper, aluminum and brassi. Conversion coatings, achieved by chemical or electrochemical processing, change and increase existing surface properties.
oxide coating, one of the three common variants, is usually applied to iron alloys such as steel, although sometimes used for copper and brass. Oxide coatings are achieved by exposing the surface of the metal chemicals that react with specific ingredients in the metal and create an increased oxide layer. These coatings lend treated metal metal resistance, decorative properties, dimensional stability and in some cases a receptive layer for colors. Examples of oxide conversion coatings include a weapon of bluing, black oxide, submersible baths and anodization. Oxide conversions are commonly found on weight parts such as fasteners, bearings, firearms, railway tracks and tools.
Second member of the Family Family Family is FOS TreatmentFat. This matte gray conversion coating, which is also known under trade names, such as lubrite and parkerization, includes spraying of phosphate or immersion process, during which the crystalline layer of iron, zinc or manganese is "grown" on the metal surface. Iron phosphan is applied as corrosion resistant and primer for painting. Zinc layers are used as a paint from color on automotive or freight bodies and household appliances. Zinc coatings also apply to the drawing of cold form to extend their lives. Manganese phosphate layers are applied to high voltage engine parts such as pistons, rings, camshafts and gears, where it acts as a friction reduction and lubricating oil tank.
The third type of conversion coating, chromate treatment, lends a bright or yellow coating to the metal parts. Chromate conversion coatings can be used in conjunction with wiring processes such as anodization, where they are applied as a masked layer to form conductive roads. TheseHot modifications, also known as Irridite or Alodin, offer good corrosion resistance and electricity well. They can also be applied as primers for colors and dyes. Chromate coatings are usually used as protection layers on aluminum alloys that cannot be anodized, surface treatment for electronic power supply and as a treatment for damaged or anodized parts.