【摘要】 为了提高高锰铝青铜耐蚀性,利用激光熔覆技术在其表面制备了铜基合金涂层.利用场发射扫描电镜、能谱仪和电化学技术对熔覆层的组织、成分以及在模拟海水中的耐蚀性进行了系统研究.激光熔覆层组织致密、细小、无裂纹.电化学实验结果显示,激光熔覆层在模拟海水中的腐蚀电位比基体提高了0.23 V,而腐蚀电流密度则小于基体的1/4,阻抗显著提高,这表明激光熔覆层具有更好的耐海水腐蚀性能,这是因为激光熔覆层组织致密、细小,且镍含量较高.腐蚀形貌显示,高锰铝青铜的腐蚀形式为选择性腐蚀,而激光熔覆层是局部点蚀.更多还原

【Abstract】 In order to improve the corrosion resistance of copper manganese aluminum alloy, a copper based alloy coating was prepared on a copper manganese aluminum alloy by laser cladding process. The microstructure and composition of the laser clad were analyzed by field emission scanning electron microscopy with an energy dispersive spectrometer, and the corrosion resistance was investigated in simulated seawater by electrochemical technology. The laser cladding layer is dense, fine, and free of cracks. The corrosion potential of the laser cladding layer in the simulated seawater is increased by 0.23 V compared with the substrate, and the corrosion current density is reduced to 1/4, and the impedance is significantly improved. This indicates that the laser cladding layer has better seawater corrosion resistance because the laser cladding layer is dense, fine, and has a high nickel content. Corrosion morphology shows that the corrosion form of high manganese aluminum bronze is selective corrosion, while the laser cladding layer is local pitting.更多还原