摘要 |
<p>High-speed plating of corrosion-resistant, chromium alloy coatings from divalent/trivalent chromium solutions is feasible with high current densities, rapid solution flow and careful control of pH. Chromium-iron alloy (optionally further containing nickel and/or cobalt) coatings are plated on copper cathodes, for example, from trivalent chromium baths at 30 microns per minute and 160 A/dm2. Current densities in the range of about 75-400 A/dm2 (5-26 A/in2) are most useful.</p> |