발간논문

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Vol.34, No.6, 773 ~ 779, 1996
Title
Research Paper - Surface Treatment - : Development of Plating Technology for Hard Chrome with Improved Wear and Corrosion Resistance
최용 Yong Choi
Abstract
Effects of plating conditions such as electropolishing, an organic solution in electrolyte and vacuum aging on the wear and corrosion resistance of hard chrome deposits on the AISI 1024 steel were studied to improve the performance of the deposits. For the plating conditions of 0.6A/㎠ at 53℃, electropolishing in the electrolyte with phosphoric acid for 1 minute followed by 30 seconds in plating bath showed the best neutral salt fog spray life among the chrome coatings prepared for this study. The contamination of the plating bath with the phosphoric acid reduced the cathodic current efficiency. Chrome plated in modified Sargent bath containing Formic acid had amorphous structure supersaturated with carbon up to 2.0wt.%, which precipitated as chrome carbide such as Cr_(23)C_6 after vacuum aging above 200℃ for 1 hour. This resulted in improvement of hardness and wear resistance of the chrome layer. Considering the reduction of corrosion resistance due to the thermal effect, optimum vacuum aging condition of the chrome layer was 1 hour at 200℃
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