摘要
利用AlCl3+LiAlH4+MnCl2有机溶剂体系在低碳钢基体上进行了电镀Al-Mn合金的实验,并对不同电镀工艺下Al-Mn合金镀层的表面形貌、成分、结构、厚度、结合力和耐蚀性等进行了研究.实验结果表明,沉积出的Al-Mn合金镀层表面光滑并呈网状分布;镀层中的Mn含量(原子分数)在30/0-80/0间变化,其中Mn以Al-Mn过饱和固溶体形式存在,且按(200)面的结构进行生长.随电镀时间和电流密度的增加,Al-Mn合金镀层的厚度呈线性增大,但膜层与基体的结合力逐渐降低.Al-Mn合金镀层的耐蚀性随沉积电流密度的增加而减小,随电镀时间的延长呈先增大后减小的规律.Al-Mn合金镀层的沉积速率、结合力和耐蚀性均高于相同沉积条件下的纯铝镀层。Al-Mn合金镀层在AlCl3+LiAlH4+MnCl2有机溶剂体系中的最佳沉积工艺为电流密度0.15-0.50 A/dm2、电镀时间30-45 min.
Aluminum-manganese alloy coatings were electroplated onto carbon steel by using AlCl3 ＋ LiAlH4 ＋ MnCl2 organic solvent electrolyte, and the surface morphology, composition, structure, thickness, adhesion and corrosion resistance of Al-Mn alloy coatings were observed and determined. The results show that the deposited Al-Mn alloy coating is smooth and netlike. The component of manganese with atomic concentration of 3%-8% existed in the coating with Al-Mn supersaturated solid solution and formed in the structure of （200） orientation. With the increase of current density and deposition time, the thickness of coatings rises linearly, but the adhesion force of alloy coatings with the matrix decreases. The corrosion resistance of Al-Mn alloy coatings in 3.5% NaCl solution is reduced with the increase of current density, and there is a maximum for the corrosion resistance of Al-Mn alloy coating under the deposition time of 30 min. The deposition rate, adhesion force and corrosion resistance of Al-Mn alloy coating are greater than that of pure aluminum coating under the same electrodeposition condition. The optimum deposition parameters for Al-Mn alloy coatings in organic solvent electrolyte are the current density of 0.15 to 0.50 A/dm^2 and deposition time of 30 to 45 min.
出处
《天津大学学报》
EI
CAS
CSCD
北大核心
2007年第2期221-227,共7页
Journal of Tianjin University(Science and Technology)
基金
国家自然科学基金委员会与中国工程物理研究院NSAF联合基金资助项目(10376023)
关键词
AL-MN合金
电镀
有机溶剂体系
微观结构
耐蚀性
Al-Mn alloy
electroplating
organic solvent electrolyte
microstructure
corrosion resistance
