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| Research on Removal Technology of Bonded Copper on the Wear-resistant and Heat-resistant Surface |
| Received:April 19, 2014 Revised:April 23, 2014 |
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| DOI：10.7643/issn.1672-9242.2014.04.014 |
| KeyWord:bonded copper corrosion dissolution rule electrochemistry behavior |
| Author | Institution |
| HU Ge |
Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing , China |
| MENG Hui-min |
Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing , China |
| WANG Hao-yu |
Institute of Material Science and Engineering, University of Science and Technology Beijing, Beijing , China |
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| Abstract: |
| Objective To obtain the economical and environment friendly chemical dissolution process of wear-resistant bonded copper. Methods The optimized chemical dissolution processes were obtained from a series of orthogonal experiment. Corrosion dissolution rule and electrochemical behavior of copper and artillery barrel in chemical solutions were investigated using the continuous weight loss method, polarization curve and E-t curve. The morphology of the copper in the corrosion process was observed as well. Results The chemical dissolution processes were hydrogen peroxide-citric acid system—H2 O2 (0. 8% ) +C6 H8 O7 (6 g / L) +θ(30℃ ) + pH(10) , and potassium bromate-citric acid system—KBrO3 (30 g / L) + C6 H8 O7 (30 g / L) +θ(30 ℃ ) + pH (10) , respectively. In the electrochemical test, the oxidation film of copper was gradually dissolved during the initial period, then the corrosion potential became negative with the increase of the dissolution rate. With the extension of time, copper matrix was exposed and entered the stable dissolution process and the dissolution rate tended to be stable. The corrosion current density derived from the polarization curve of the copper in potassium bromate-citric acid solution was two orders of magnitude greater than that in the hydrogen peroxide-citric acid solution, suggesting a much stronger ability of anodic activation. Conclusion Copper exhibited fast and stable dissolution rate, and the current density of artillery barrel was 2 ~ 3 orders of magnitude lower than that of the copper in both chemical solutions, suggesting excellent anti-corrosion performance. |
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