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Process flow of stainless steel coil
The original process flow of stainless steel coil: mechanical polishing organic solvent deoiling chemical deoiling hot water washing electrochemical deoiling hot water washing cold water washing 30% HCl cold water washing 20% HCl cold water washing cold water washing flash nickel plating electroless nickel plating.
The disadvantage of the original stainless steel coil process is that the effect of removing oxide scale by HCL alone is not good; the uniformity of electroless nickel plating is affected by the poor coverage ability of the complex parts; the fresh surface of the stainless steel coil in Wuxi may be oxidized to film again because of the long process; the electroless nickel plating solution is easily polluted by the electroless nickel plating solution, etc. To this end, some people have improved the process.
Improve the process flow of stainless steel coil: polishing and degreasing process with the original process mixed acid degreasing (25% HCl + 8% HNO 3 + 10% HF) cold water washing activation (10% HCl + 5% NH 4F, 60 hot water washing electroless nickel plating.
Advantages of improved process:
(1) Mixing acid was used to remove the insoluble FeCrO4 oxide film, Si and SiO 2 on the surface of Wuxi stainless steel coil, which enhanced the chemical activity of the substrate surface.
(2) The process is simplified to avoid re-oxidation of fresh surface of stainless steel roll in Wuxi.
(3) Increase the preheating process of the matrix to eliminate the stress caused by the temperature difference between the coating and the matrix.
Therefore, electroless nickel plating has good bonding force with the matrix and fast plating speed.