摘要
研究了用复合电沉积法制备的锌铝镀层在微酸性腐蚀介质中的耐蚀能力。失重法、电化学性能试验证明：镀液中的氢氧化铝也能改善镀层的耐蚀性，但不如铝粉的作用显著。电子探针和等离子光谱显示合氢氧化铝和含铝粉镀层中的铝呈均匀分布状态，但前者铝的含量为５０ｐｐｍ，后者相对较多为０．１５％。Ｘ－射线衍射法揭示溶液中的氢氧化铝能使镀层的结晶细致，晶面择优取向程度增加。当镀液中含有铝粉时，所得镀层的结构则成为层状，且结晶更加细致，晶面择优程度更大。因此，氢氧化铝和铝粉是通过提高镀层的晶面择优取向程度，从而改善了其耐蚀性能。
The effect of aluminium element on corrosion-resistant electrodeposited Zinc coating has been investigated in this paper. It is discovered that Al(OH)3 colloid in electrolyte can improve corrosion resistance of the coating, but is not as effective as aluminium particles through the experiments on the weight loss method and the electrochemical test.EPMA and ICP tests showed Al element in coatings containing Al(OH)3 and Al particles are uniformly scattered, but in the former test the aluminium content is 50ppm, while in the latter 0. 15% (w/w). X-ray diffraction testified that Al (OH)3 colloid could make the crystal grains of the coating finer with higher degree of the preferred orientation. The crystal structure of coating obtained from the solution containing Al particles became stratified with much finer in crystallization and preferred orientation. Therefore, Al (OH)3 colloid and Al particles are able to increase degree of the preferred orientation of crystal planes, resulting in improvement of the corrosion resistance of coatings.
出处
《南京航空航天大学学报》
CAS
CSCD
1994年第4期510-516,共7页
Journal of Nanjing University of Aeronautics & Astronautics
关键词
电沉积
耐蚀性
锌铝合金
镀膜
electro-deposition
preferred orientation
corrosion resistance
Zn-Al alloy
coating films
