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设计并制备了一种新型超高强Cu-6.5Ni-1Al-1Si-0.15Mg-0.15Ce合金,采用扫描电镜观察、透射电镜观察、光电子能谱分析等手段研究该合金在3.5%NaCl溶液中的腐蚀行为。合金经固溶、冷轧80%并在450°C时效1 h后具有最佳的综合性能,其硬度为HV 314,导电率为19.4%IACS,抗拉强度为1017 MPa,年平均腐蚀速率为0.028 mm/a。腐蚀初期合金表面形成了氧化腐蚀产物和氯化腐蚀产物,随着腐蚀时间延长形成了氢氧化物腐蚀产物。合金具有超高的强度、优良的导电率和耐腐蚀性能是由于Ni_2Si能够抑制晶界处粗大NiAl相的析出,并能抑制合金的脱Ni腐蚀。
A novel ultra-high strength Cu-6.5Ni-1Al-1Si-0.15Mg-0.15Ce alloy was designed and prepared. The alloy was investigated in 3.5% NaCl solution by scanning electron microscopy, transmission electron microscopy and photoelectron spectroscopy Corrosion behavior. The alloy has the best overall properties after solution treatment, cold rolling 80% and aging at 450 ° C for 1 h. The hardness is HV 314, the electrical conductivity is 19.4% IACS, the tensile strength is 1017 MPa, and the annual average corrosion rate is 0.028 mm / a. Oxidation corrosion products and chlorinated corrosion products were formed on the surface of the alloy at the initial stage of corrosion, and hydroxide corrosion products were formed as the corrosion time prolonged. The alloy has high strength, excellent electrical conductivity and corrosion resistance due to Ni 2 Si can inhibit the precipitation of coarse NiAl phase at the grain boundary, and can inhibit the removal of Ni alloy corrosion.