The doorknobs are made of zinc alloy material with black chromium plating. This paper puts forward a new process for plating black chromium on gyroscope casing by analyzing the electrochemical reaction mechanism of plating black chromium,and indicates the composition of plating solution, process condition, and the effect of impurity ion on plating black chromium. It is proved in practice that the new plating solution has good dispersive capacity, and the finished black chromium plating has certain degree of activity, which can realize secondary plating black chromium. This new process is not only practical, but also saves manhour and energy.
Material: zinc alloy
Surface treatment: black chromium
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