AZ31镁合金表面钙磷涂层在Hank′s液中的腐蚀行为
Corrosion Behavior of AZ31 Magnesium Alloy with Calcium Phosphate Coating in Hank′s Solution
摘 要
采用电化学沉积法在AZ31镁合金表面制备了钙磷涂层, 采用X射线衍射仪和三维显微镜分析了涂层的相组成和形貌, 采用析氢试验和动电位扫描技术研究了AZ31镁合金和钙磷涂层在Hank′s液中的腐蚀行为。结果表明, 电化学沉积法在AZ31镁合金基体上制备了均匀的透钙磷石(CaHPO4·2H2O)片状晶体。该钙磷涂层能有效地降低AZ31镁合金基体在Hank′s液中浸泡初期的腐蚀速率, 自腐蚀电流密度较AZ31镁合金下降两个数量级; 随着涂层的不均匀溶解, AZ31基体发生明显的局部腐蚀, 出现半径约200 μm, 深度近500 μm的腐蚀坑。残余涂层和基体间未出现明显的电偶腐蚀效应。
电沉积
钙磷涂层
Hank′s液
magnesium alloy
electrolytic deposition
calcium phosphate coating
Hank′s solution
Abstract
A calcium phosphate coating was fabricated on AZ31 magnesium alloy surface by electrochemical deposition method. The morphology and structure of the coating were analyzed by three-dimensional digital microscope and X-ray diffractometer. The corrosion behaviors of AZ31 magnesium alloy and calcium phosphate coating in Hank′s solution were investigated by the hydrogen evolution testing and the potentiodynamic scan technique. The results showed that the deposited coating predominately consists of flake-shape brushite (CaHPO4·2H2O) crystallites. The coating can decrease the corrosion rate of AZ31 substrate immersing stage in Hank′s solution. At the initial stage, the corrosion current density decreased 2 orders of magnitude. With the degradation of the coating, the protectivity of the coating decreased and obvious localized corrosion occured on the sample surface.
中图分类号 TG174
所属栏目 试验研究
基金项目 国家自然科学基金(51201119)
收稿日期 2013/5/30
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联系人作者刘静(wkdliu@126.com)
备注刘静(1964-), 教授, 博士生导师, 从事材料腐蚀与防护研究,
引用该论文: HU Qian,CHEN Yu-hui,LIU Jing,ZHANG Xiang-dong,HUANG Feng. Corrosion Behavior of AZ31 Magnesium Alloy with Calcium Phosphate Coating in Hank′s Solution[J]. Corrosion & Protection, 2014, 35(4): 311
被引情况:
【1】胡骞, "镁合金钙磷涂层化学沉积过程及在生理盐水中腐蚀行为的原位研究",腐蚀与防护 36, 329-333(2015)
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【7】万晔, 王艳娜, 王强, 等. 表面改性后AZ31B镁合金在不同模拟体液中的降解性能研究[J]. 材料导报B:研究篇, 2011, 25(3):66-69.
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【9】王增辉, 卫中领, 李春梅, 等. WE43镁合金表面电沉积羟基磷酸钙膜层在模拟体液中的耐腐蚀性[J]. 腐蚀与防护, 2011, 32(3):182-184.
【10】时海燕, 胡仁, 林昌健. 羟基磷灰石涂层的电化学可控制备及生物性能的初步表征[J]. 电化学, 2005, 11(4):440-443.
【11】HING K A, BEST S M, TANNER K E, et al. Quantification of bone ingrowth within bone-derived porous hydroxyapatite implants of varying density[J]. Mater Sci:Mater Med, 1999, 7(10):663-667.
【12】HAN Y, XU K W. Morphology and composition of hydroxyapatite coatings prepared by hydrothermal treatment on electrodeposited brushite coatings[J]. Mater Sci Mater Med, 1999, 10(2):243-248.
【13】王勇, 高家诚, 张亚平, 等. 钛合金表面仿生矿化的热力学分析[J]. 稀有金属材料与工程, 2004, 33(4):397-399.
【14】肖秀峰, 唐晓恋, 高燕娇, 等. 工艺条件对电沉积磷酸钙盐组分和结构的影响[J]. 材料保护, 2005, 38(1):29-32.
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