Chromium plating is a process of electroplating a thin layer of chromium on the metal surface. This process uses an electrochemical reaction to deposit the charge carried by chromium ions in the electrolyte on the cathode surface to form a dense chromium layer.
Corrosion resistance: The chrome layer can resist the erosion of most organic acids, sulfides and alkalis, so it has high corrosion resistance.
High wear resistance: The friction coefficient of the chrome layer is small, especially the dry friction coefficient, which is the lowest among all metals, so it has excellent wear resistance.
Good chemical stability: The chrome layer does not react in alkali, sulfide, nitric acid and most organic acids, but can be dissolved in hydrochloric acid (such as hydrochloric acid) and hot sulfuric acid.
High hardness: The hardness of the chrome layer can be adjusted according to the composition of the plating solution and the process conditions, and the hardness ranges from 400 to 1200 HV.
High reflectivity: The reflectivity of chrome in the visible light range is about 65%, and because chrome does not change color, its reflectivity can be maintained for a long time during use.
The chrome plating process usually includes the following steps:
Degreasing: remove grease and impurities on the metal surface to ensure the purity of the electroplating process.
Cleaning: thoroughly remove tiny dirt and dust particles on the surface.
Base treatment: treat the base metal, such as copper plating or nickel plating, to ensure good bonding between the plating layer and the substrate.
Electroplating: put the metal into the plating solution containing chromium compounds to form a chromium layer on the metal surface through electrochemical reaction. The thickness of the plating layer can be adjusted according to demand.
Passivation (optional): soak the chromium layer in a certain concentration of nitric acid to form an oxide film on its surface to improve the corrosion resistance and wear resistance of the chromium layer.
The chromium plating process has significant advantages in terms of hardness, wear resistance, corrosion resistance, and aesthetics, but it also has disadvantages such as higher cost, high requirements for plated parts, coating thickness restrictions, environmental pollution, complex processes, and brittleness and shedding. . In practical applications, the appropriate electroplating process needs to be selected based on specific needs and conditions.
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