(1. 燕山大学 材料科学与工程学院，秦皇岛 066004；
2. 河北科技大学 材料科学与工程学院，石家庄 050018)
摘 要: 利用化学镀对铸态Zr-Al二元合金进行表面处理，在经过除油、酸洗、化学转化处理等预处理工序后，在化学镀液中施镀在合金表面生成Ni-P镀层。利用扫描电镜和X射线衍射仪对合金、化学转化膜以及化学镀层的组成及微观结构进行表征。结果表明：铸态Zr-Al合金由α相(α-Zr)和β相(Zr2Al)组成，其中基体为α相，β相沿晶界呈非连续分布；经锌系化学转化处理后合金表面形成以Zn3(PO4)2？H2O为主要成分的化学转化膜，该膜由细小的片状晶体颗粒密排堆积而成；在此基础上进行化学镀镍磷处理，在铸态Zr-Al合金表面得到Ni-P镀层，其表面颗粒均匀，无明显孔隙缺陷，结合紧密，镀层与基体结合良好。
关键字: 铸态Zr-Al合金；化学转化处理；化学镀；Ni-P镀层
（1. College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, China;
2. College of Materials Science and Engineering, Hebei University of Science and Technology,
Shijiazhuang 050018, China）
Abstract:The electroless nickel-plating on as-cast Zr-Al alloy was studied. After degreasing, pickling, chemical conversion treatment, Ni-P coating on Zr-Al alloy was plated from the electroless plating solution. The microstructure and the phase composition of Zr-Al alloy, phosphate coating and Ni-P coating were observed using scanning electron microscopy (SEM) and XRD, respectively. The results show that as-cast Zr-Al alloy is composed of α-Zr and Zr2Al, where α-Zr is substrate and Zr2Al spreads along grain boundaries discontinuously. The Zn3(PO4)2？H2O conversion film after treated by the chemical conversion solution is formed. The film consists of small crystal particles densely. The Ni-P coating is successfully deposited on the conversion film. The electroless Ni-P coating is uniform, compact and has no obvious defects. The adhesion of the electroless Ni-P coating and substrate satisfies the requirement of ISO 2819.
Key words: as-cast Zr-Al alloy; chemical conversion treatment; electroless plating; Ni-P coating
