摘要
采用化学镀技术在LY12铝合金表面制备了Ni-P合金梯度镀层,该梯度镀层的总厚度大约40μm,镀层中P含量从最内侧的6.27%逐渐升高到最外侧的14.74%。三种镀层的表面虽然均为非晶态结构,可保护基体不受侵蚀,但稀土Y(NO3)3的添加可使镀层的非晶化程度进一步提高,更容易形成钝化膜,使镀层的耐蚀性得到提高。对比3种镀层的腐蚀速率及极化曲线,在酸性介质中镀层的耐蚀性表现为:Ni-P梯度/Y(NO3)3涂层>Ni-P/Y(NO3)3涂层>Ni-P梯度涂层。
Ni-P alloy gradient coatings on LY12 aluminum alloy were prepared by electroless technology. The gradient coating thickness is about 40 μm. The phosphorus content within the gradient coatings increases from 6.27 wt% at the inside to 14.74 wt% at the outside section. The surfaces of three kinds of coating possess amorphous structure, which can protect the substrate from corrosion. The adding of rare earth Y （NO3）3 into the coating can increase the amorphous degree. It is easier to form passivation film, and thus improve the corrosion resistance of the coatings. Compared with the corrosion rates and polarization curves of the three kinds of coatings, the corrosion resistance of the three coatings in acidic medium is characterized by：Ni-P gradient/Y （NO3）3 coating〉Ni-PfY （NO3）3 coating〉Ni-P gradient coating.
出处
《热加工工艺》
CSCD
北大核心
2014年第20期118-120,122,共4页
Hot Working Technology
基金
国家自然科学基金(50172023)
2012年榆林市产学研合作项目
2012年国家级大学生创新训练计划项目(201210704058)
2013年陕西省大学生创新训练计划项目(1151)
关键词
稀土
化学镀
梯度镀层
耐蚀性
rare earth（RE）
electroless plating
gradient coating
corrosion resistance
