Thick cladding of copper on mild steel substrate has been produced using a novel multipass friction stir welding (FSW) process, executing several adjacent passes, covering the entire steel substrate. Metallography examination reveals proper bonding between clad copper and steel substrate, with grain refinement for the steel region near the interface, while the copper portion depicts grains coarsening due to multipass action during FSW. The clad copper plates and base copper were tested for their corrosion behaviour in 3.5% NaCl solution through the potentiodynamic polarisation method. The study suggests corrosion rate of cladded plates were nearly same as pure copper, and much lower than the steel substrate. SEM-EDS and XRD examination depicts oxide layer formation for the corroded clad top. Atomic force microscopy reveals the presence of pits and valleys in the corroded clad copper top. The experimental results suggest multipass cladding through FSW does not degrade the corrosion properties of copper to a greater extent, and are comparable to base copper results.

采用新型多道搅拌摩擦焊 (FSW) 工艺在低碳钢基材上生产厚铜覆层，执行多个相邻焊道，覆盖整个钢基材。金相检查显示包层铜和钢基体之间有适当的结合，界面附近的钢区域晶粒细化，而铜部分则显示由于搅拌摩擦焊期间的多道作用而导致晶粒粗化。采用动电位极化法测试了复合铜板和基铜在3.5% NaCl溶液中的腐蚀行为研究表明，复合板的腐蚀速率与纯铜几乎相同，并且远低于钢基材。SEM-EDS 和 XRD检查显示了腐蚀包层顶部氧化层的形成。原子力显微镜揭示了腐蚀的包层铜顶部存在凹坑和山谷。实验结果表明，通过 FSW 进行的多道熔覆不会在更大程度上降低铜的腐蚀性能，并且与基础铜结果相当。