Tin–Cobalt–Zinc Ternary Alloy Chrome‑Replacement Process: “Chrome‑Replacement‑90 Additive”
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Detailed description:
Conventional chromium plating suffers from low current efficiency, significant environmental pollution, and poor deep‑plating capability; in particular, small parts are difficult to barrel‑plate, resulting in extremely low production efficiency. The coating produced by this process closely resembles a chromium layer, with corrosion resistance and surface brightness comparable to those of chromium, while its deep‑plating performance far surpasses that of conventional chromium plating and its energy consumption is markedly lower. A key advantage is its suitability for the standard barrel plating of small components, thereby enhancing production efficiency. For industrial products that do not have specific hardness requirements, adopting this process as a chromium‑replacement coating can deliver substantial economic benefits.
Coating Performance
1. Neutral Salt Spray Test, Grade 5
2. Coating Hardness: 220 V/25 g (Shimadzu M-type microhardness tester, Japan)
3. Wear resistance: 39.4 mg/thousand cycles (using the Japanese NOSTSO‑1 micro‑planar abrasion tester)
Process formulation and operating conditions
| Stannous chloride | 20-30g/L | Chromium substitute stabilizer | 4-8g/L | ||||||
| Cobalt(II) chloride | 8-12g/L | pH | 8.5-9.5 | ||||||
| Zinc chloride | 5-10g/L | T | 20-45℃ | ||||||
| Potassium pyrophosphate | 220-280g/L | Current density | 0.1-0.2 A/dmm² | ||||||
| Chromium-90 additive | 20-30ml/L | Anode | Pure tin plate | ||||||
Keywords:
Tin–Cobalt–Zinc Ternary Alloy Chrome‑Replacement Process: “Chrome‑Replacement‑90 Additive”
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