激光冲击强化对黄铜耐蚀性能的影响

为了提高黄铜表面的力学性能和耐蚀性,采用纳秒脉冲激光(波长1064nm,脉宽7ns)冲击强化(LSP)黄铜表面。通过分析激光冲击强化黄铜样品表面的残余应力、横截面金相组织和硬度、表面形貌等力学性能,研究了其对耐蚀性能的影响。结果表明,与未经LSP处理的黄铜样品相比,LSP处理后黄铜样品的电化学腐蚀电位增加,空蚀损失质量降低,仅为原来的1/4,空蚀孕育期时间延长了2倍,空蚀速率降低,从而LSP处理提高了黄铜样品的耐蚀性能。该研究对普通黄铜应用在具有腐蚀性的工作环境中是有帮助的。

Effect of laser shock processing on corrosion resistance of brass

In order to improve mechanical properties and corrosion resistance of brass surface, laser shock processing (LSP) of brass surface was achieved by nanosecond pulse laser (wavelength of 1064nm and pulse width of 7ns). The mechanical properties such as surface residual stress, cross section metallographic structure, hardness and surface morphology of LSP brass were analyzed. The effects of these properties on corrosion resistance were studied. The results show that, compared with brass samples without LSP treatment, the electrochemical corrosion potential of brass samples increases after LSP treatment. The quality of cavitation loss is reduced by only 1/4 of the original. The incubation period of cavitation erosion was prolonged by two times. The rate of cavitation erosion decreases. LSP treatment improves the corrosion resistance of brass samples. This study is helpful for the application of ordinary brass in corrosive working environment.