Phosphating may be a conversion coating applied to Steel and Iron components. In its basic form, the method involves immersing a component in a dilute solution, which converts the surface of the metal into a layer of microscopic Phosphate Crystals. The crystalline nature of this coating retains oil and provides a ‘foothold’ for paint then is most frequently used as a pre-treatment process. the three types of Phosphating are Iron, Zinc, and Manganese and also the distinction is indicative of the crystals that are formed with each.
Iron Phosphating will increase paint adherence and impact resistance additionally as provide protection against oxidation. It offers the smallest amount corrosion resistance of the phosphating processes but because of its low cost is commonly used on indoor equipment and other parts which can not be subjected to high levels of wear and corrosion. the color of the deposit will differ depending on the load of the coating starting from a pale blue in a light deposit to a grey color for a heavy deposit.
As with all Phosphate processes the first application is as an undercoat for lubricants or paint. Manganese Phosphating is probably the most absorbent of the three processes and is commonly used as a carrier for rust inhibiting oils and waxes. it’s primarily used as a means to stop metal on metal contact. Manganese Phosphate is mostly more corrosion resistant and then Iron Phosphate and is additionally more stable than Zinc under higher pressures and temperatures. it’s the most wear resistant of the three, but not as corrosion resistant as Zinc Phosphate. Manganese Phosphating will prevent galling without the coating flaking or peeling off and is popular within the automotive and power transmission industries. In terms of colour, Manganese Phosphate may be a dark grey, near black.
Zinc Phosphating is primarily selected for corrosion protection of ferrous metals. Zinc Phosphate is suitable for hard weather applications and is most well liked within the automotive industry. almost like the other processes, Zinc Phosphate will inhibit galling and increase lubricity also as acting as a carrier for paint, oils, and waxes. Visually, Zinc Phosphating are a dark shade of grey, although are often dyed to produce a matte black finish.
Silchrome Plating provides a large range of conversion coating which includes Iron, Manganese, and Zinc Phosphate finishes. We are fully ISO 9001 and 14001 certified and perform all our processes from our modern facility in Leeds, West Yorkshire .