化学沉积NiZnP合金及其性能  

Electroless Plating NiZnP Alloy and Its Properties

作　　者：王森林[1] 

机构地区：[1]华侨大学材料科学与工程学院,泉州362011

出　　处：《应用化学》2004年第6期576-580,共5页Chinese Journal of Applied Chemistry

基　　金：福建省自然科学基金资助课题 (E0 2 10 0 2 0 )

摘　　要：用柠檬酸钠为络合剂、硼酸为缓冲剂在碱性体系中用化学沉积法由ZnSO4、NiSO4、NaH2 PO2 和H2 BO3 制得了NiZnP合金。考察了 pH和ZnSO4与 (ZnSO4+NiSO4)摩尔比对沉积速度、镀层组成、结构、表面形貌和耐腐蚀性能的影响。发现锌在沉积过程中起阻碍作用 ,致使镀层中锌含量不高 (不超过原子分数2 0 % )。用X射线衍射、透射电镜和扫描电镜等技术研究了镀层的结构和表面微观形貌。结果表明 ,镀态合金由非晶和少量立方镍两相组成 ;工艺条件对镀层表面微观形貌有明显的影响。采用浸泡实验和电化学阳极极化实验 ,重点研究了不同工艺条件的镀层在质量分数为 3 5 %的NaCl溶液 (pH =7 0 )中的耐腐蚀性能。结果表明 ,不同工艺条件所得的镀层耐腐蚀能力不同 ,NiZnP合金的耐腐蚀性主要与镀层组成有关 ,含锌量越高、含磷量越低的镀层耐腐蚀性越好。Electroless plating NiZnP alloys have been obtained from the bath having boric acid as a buffer agent and sodium citrate as a complexing agent. The effects of deposition parameters, such as pH and mole ratios of ZnSO 4 to (ZnSO 4+NiSO 4) on the plating rate, coating composition, structure, surface morphology and corrosion resistance of the alloys were examined. It was found that the presence of zinc sulfate in the bath has an inhibitory effect on the alloy deposition. As a consequence, the percentage of zinc in the deposits never reaches values higher than at.20%. The structure and surface morphology were charactered by XRD, TEM and SEM. The NiZnP alloy consists of amorphous phase together with little cubic nickel phase, and its surface morphology depencdes on the deposition variables. The corrosion resistance of the NiZnP deposits in ω(NaCl)=3.5% solution(pH=7.0) was studied by mass loss test and electrochemical anodic polarization measurement. The results show that the depo sits plated at different deposition condition have different corrosion resistance and the deposits with higher percentage of zinc and less percentage of phosphorus have better resistance corrosion than that with less percentage of zinc and higher percentage of phosphorus. The results of mass loss tests were basically in accordance with that from electrochemical anodic polarization measurements.

关 键 词：NiznP合金 化学沉积 耐蚀性 

分 类 号：O646[理学—物理化学]