Al-Cu-Mg-Ag新型耐热铝合金的抗腐蚀性能

发布时间：2018-07-10 19:54

本文选题：Al-Cu-Mg-Ag + 耐热铝合金　；参考：《中国有色金属学报》2015年11期

【摘要】：通过晶间腐蚀、剥落腐蚀、电化学和透射电镜等方法研究热处理制度对Al-Cu-Mg-Ag耐热铝合金组织与抗腐蚀性能的影响。结果表明:随着时效时间的延长,合金晶内和晶界析出相逐渐长大,晶界析出相由连续分布转变为不连续分布,无沉淀析出带(PFZ)逐渐变宽,合金的抗晶界腐蚀性能和抗剥落腐蚀性能逐渐降低。基体腐蚀电位φmatrix、PFZ腐蚀电位φPFZ和晶界析出相腐蚀电位φθ在晶间腐蚀液和剥落腐蚀液中符合φmatrixφθφPFZ。具有最低腐蚀电位的PFZ决定了合金的抗腐蚀性能。随着时效时间的延长,晶界析出相的粗化使得PFZ变宽,Cu原子减少,电位负移,PFZ与基体的电位差变大,腐蚀通道变宽,合金的耐蚀性降低。不同时效状态的Al-Cu-Mg-Ag耐热铝合金的抗腐蚀能力由强至弱的顺序为:欠时效的,峰时效的,过时效的。
[Abstract]:The effect of heat treatment on the microstructure and corrosion resistance of Al-Cu-Mg-Ag heat-resistant aluminum alloy was studied by means of intergranular corrosion, exfoliation corrosion, electrochemical and transmission electron microscopy. The results show that with the aging time prolonging, the precipitated phases in and at the grain boundaries grow up gradually, the precipitates at the grain boundaries change from continuous distribution to discontinuous distribution, and the precipitation band without precipitation (PFZ) gradually widens. The grain boundary corrosion resistance and peeling corrosion resistance of the alloy decreased gradually. The matrix corrosion potential 蠁 matrix 蠁胃 PFZ and the grain boundary precipitated phase corrosion potential 蠁胃 are consistent with 蠁 matrix 蠁胃 PFZ in intergranular and spalling corrosion fluids. The corrosion resistance of the alloy is determined by PFZ with the lowest corrosion potential. With the prolongation of aging time, the coarsening of precipitated phase at grain boundary reduces the Cu atom in PFZ, increases the potential difference between PFZ and substrate, widens the corrosion channel and decreases the corrosion resistance of the alloy. The order of corrosion resistance of Al-Cu-Mg-Ag heat-resistant aluminum alloy with different aging states from strong to weak is underaging, peak aging and overaging.
【作者单位】：河北工程大学装备制造学院;
【基金】：河北省自然科学基金资助项目(E2013402056) 河北省高等学校科学技术研究项目(QN2014002) 邯郸市科学技术研究与发展计划项目(1321110085-4)
【分类号】：TG146.21

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