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采用光学显微镜、扫描电镜、盐水浸泡等方法研究了退火热处理工艺对Al/ZE42/Al复合板界面微观组织和该复合板在5.0%Na Cl(质量分数)水溶液中腐蚀行为的影响。实验结果表明:Al/ZE42/Al复合板经退火处理后,界面区域发生Mg和Al等元素的互扩散,界面扩散层包含2个反应层,靠近ZE42镁合金一侧的反应层为Mg_(17)Al_(12)相,靠近Al板一侧的反应层为Al_3Mg_2相,随着退火温度的升高或者保温时间的延长,ZE42/Al界面扩散层的厚度增加,ZE42镁合金发生了再结晶组织转变;退火热处理没有明显改善Al/ZE42/Al复合板的耐腐蚀性能,提高了腐蚀速率,其腐蚀机制为复合板边部向内部扩散而导致的电偶腐蚀加剧。
The effects of annealing process on the interfacial microstructure of the Al / ZE42 / Al composite plate and the corrosion behavior of the composite plate in 5.0% NaCl (mass fraction) aqueous solution were studied by means of optical microscope, scanning electron microscope and salt water immersion. The experimental results show that the interface diffusion layer contains two reaction layers after the Al / ZE42 / Al composite sheet is annealed, and the reaction layer near the ZE42 magnesium alloy is Mg 17 ) Al_ (12) phase, the Al_3Mg_2 phase is near the Al plate. With the increase of annealing temperature or holding time, the thickness of ZE42 / Al interface diffusion layer increases and the recrystallization structure of ZE42 magnesium alloy The annealing treatment did not improve the corrosion resistance of Al / ZE42 / Al composite board significantly and increased the corrosion rate. The corrosion mechanism was that the galvanic corrosion of the Al /