基于剥落腐蚀试验,研究了火焰矫正次数对Al?Zn?Mg铝合金抗腐蚀性能的影响.结果表明,火焰矫正会导致Al?Zn?Mg铝合金抗腐蚀性能降低,其抗腐蚀性能顺序为:母材>2次热矫正>3次热矫正>1次热矫正.Al?Zn?Mg铝合金剥落腐蚀性能变化主要与晶界析出相以及基体析出相的转变有关.随着火焰矫正次数的增加,无沉淀析出带消失,晶界析出相经历了回溶和再析出过程.经1次火焰矫正后,Al?Zn?Mg铝合金的晶界析出相更加连续,因此抗腐蚀性能最差.
The corrosion resistance of Al?Zn?Mg alloy subjected to different times in flame rectification was investigated based on the exfoliation corrosion test. The results indicate that the flame rectification deteriorates the exfoliation corrosion resistance of Al?Zn?Mg alloy. The corrosion resistance of Al?Zn?Mg alloy is ranked in the following order: base metal>two times>three times>one time of flame rectification. The exfoliation corrosion behavior was discussed based on the transformation of precipitates at grain boundaries and matrix. With increasing the number of times in flame rectification, the precipitate-free zones disappeared and the precipitates experienced dissolution and re-precipitation. The sample was seriously corroded after one time of flame rectification, because the precipitates at grain boundaries are more continuous than those in other samples.
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