Phosphating is relatively cheaper than galvanizing, but its corrosion resistance is worse than galvanizing. After phosphating, oil should be applied, and the level of corrosion resistance is closely related to the performance of the oil applied. For example, after phosphating, applying general anti rust oil, the neutral salt spray test is only 10-20 hours. Applying high-grade anti rust oil can last for 72~96 hours. But its price is 2-3 times that of general phosphating coating oil. There are two commonly used phosphating methods for fasteners: zinc based phosphating and manganese based phosphating. Zinc based phosphating has better lubrication performance than manganese based phosphating, and manganese based phosphating has better corrosion resistance and wear resistance than zinc plating. Its operating temperature can reach 225 to 400 degrees Fahrenheit (107~204 ℃). Especially the connection of some important components. Such as connecting rod bolts and nuts of the engine, cylinder head, main bearings, flywheel bolts, wheel bolts and nuts, etc. High strength bolts are treated with phosphating, which can also avoid hydrogen embrittlement problems. Therefore, bolts above grade 10.9 in the industrial field are generally treated with phosphating surface.
Shanghai Yaluo has been producing the following materials, fasteners, and components for a long time:
304、310、316、317、321、347、410、420、430、431、440、630、631、660、2205、2507、2520、1.4529、1.4980、904L、HC276、ML400、MLK500、N06625、N07718、N07750、N08825、N08925、N08926、NW2201、GH2132、GH4033、GH4080、GH4145、GH4169、A453 660A、B、C、D、17-4PH、A286、A2-70、A2-80、A3-70、A4-70、A4-80、A4-90、A5-80、A8-80、C1-70、C1-110、C3-80、C3-120、C4-70、D6-80、P1-90、F51、F53、F55、A193 B7、L7、B16、A194 B8、B8M、B8C、B8T、A307、A325、A490、A563、F1554、 4130, 4135, 4140, 4340, 4145, 8.8 grade, 10.9 grade, 12.9 grade, (stainless steel 12.9 grade), 14.9 grade, 1 Cr13、2Cr13、3Cr13、4Cr13、1Cr17Ni2、1Cr5Mo、4Cr10S2Mo、40Cr、12CrMo1V、21CrMoV5-7、35CrMoA、42CrMoA、25Cr2Mo1V、34CrNiMo6、40CrNiMoA Materials such as bolts, studs, screws, nuts, washers, pins, and components.
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