Study on the properties of Ni/Cr decorative electroplated deposits on carbon constructional steel
The porosity, morphology, roughness, tensile strength and passivation properties of the dec-orative double-layer Ni/Cr plated on carbon steel determine the quality of the product. The porosity of the coating was measured by the weting filter paper method, the surface roughness and three-dimension-al morphology of the coating were measured by the laser microscopy system, and the tensile strength and electrochemical impedance spectrum of the coating were tested. The results showed that carbon steels 60# and 55# had the highest porosity of 16.82 pcs/cm2 after being plated with a single layer of semi-bright nickel. Compared to the chrome-plated after hydrogen removal, the porosity of 60# steel sample decreased by 0.19 pcs/cm2, while the porosity of the 55# steel increased by 1.46 pcs/cm2. The single-lay-er nickel surface roughness of 60# and 55# steel was 0.460 μm and 0.523 μm, respectively. The surface roughness of 60# steel sample decreased by 0.036 μm after chrome plating, while the surface roughness of 55# steel sample increased by 0.016 μm, hydrogen removal process decreased roughness of chrome plating. The tensile strength of carbon steel after chrome plating is the smallest, and can not only im-prove the tensile strength after chromium plating, but also increase the passivation performance of the plating on 60# steel.
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