How to improve the binding capacity stainless steel electroless nickel deposits

Web Design And Seo For www.china-webdesign.com

steel pipe fittings - China Manufacturer

Thank you for inquiry my steel pipe fittings, Tel:+86-577-85989898, Email:JD@CNJIEDE.CN

http://www.steel-pipe-fittings.net/

Stainless steel parts (drive shaft, meshing, dynamic fitting) electroless nickel plating, to improve the uniformity of the coating and self-lubricating, than chromium electroplating. Stainless steel electroless nickel plating is often bad pretreatment coating and the substrate b inding force is not ideal, and the urgent need to address the problems in the actual production.

 Flash plated original process: mechanical polishing organic solvent degreasing → → the chemical degreasing → hot water washing → electrochemical degreasing → hot water washing → cold washing → 30% HCl → cold washing → 20% HCl (50 ℃) → cold washing → nickel → electroless nickel plating.stainless steel clamps

The shortcomings of the original process: Single HCL descaling ef fect is not good; complex shape pieces of flash bad coverage ability affect the uniformity of electroless nickel plating nickel plating; longer due process may cause stainless steel fresh surface re-oxidation into film; flash plating nickel electroless nickel plating solution and other solution is easily contaminated. To this end, it was to improve the process.

Improvement Process: polishing, degreasing processes with the original process → mixed acid activation (10% HCl +5% NH4F, 60 ℃) → hot water in addition to the film (25% HCl +8% HNO3 +10% HF) → cold washing → → Electroless nickel plating.stainless steel pipe fittings

Improvement of the advantages of the process:

â'  using a mixed acid to remove the stainless steel surface of insoluble FeCrO4 oxide film, Si, SiO2, so that the chemical activity enhancement of the surface of the substrate;

â'¡ The process can be simplified to avoid the stainless fresh surface and re-oxidation; â'¢ increase substrate preheating step, the elimination of the stress generated by the coating and the substrate due to temperature. Therefore, electroless plating nickel matrix binding force, the plating speed fast.steel pipe fittings