B10铜镍合金海水加速腐蚀行为

doi:10.11868/j.issn.1001-4381.2015.000411

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摘要

B10铜镍合金具有优良的耐海水腐蚀性能，为研究其在海水中的腐蚀行为，取厦门天然海水，加入双氧水作为腐蚀加速剂，在室内模拟海水全浸腐蚀实验，采用失重法、电化学阻抗谱（EIS）技术分析B10合金在海水腐蚀中的腐蚀速率随腐蚀时间的变化规律，用不同腐蚀周期的电化学阻抗谱特征来表征工作面积为1cm²的合金表面氧化膜的生长破坏情况。结合扫描电子显微镜（SEM）、能谱分析（EDX）、XPS和拉曼光谱技术分析B10合金表面腐蚀产物膜的成分以及B10合金在海水腐蚀中的腐蚀类型。结果表明，氧化膜的生成与破坏使得合金在海水中的瞬态腐蚀速率呈先减小后增大的趋势，腐蚀产物包含碱式氯化铜Cu₂（OH）₃Cl和氧化亚铜Cu₂O，腐蚀由点蚀开始，逐渐经历了晶间腐蚀-剥蚀。

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关键词 ： B10铜镍合金, 海水腐蚀, EIS, SEM, 腐蚀产物

Abstract：

B10 Cu-Ni alloy has good corrosion resistance against seawater. Natural seawater from Xiamen, was used to study the seawater corrosion behaviour of B10 Cu-Ni alloy, H₂O₂ was added as corrosion accelerator. The whole seawater immersion corrosion simulation experiments were conducted in laboratory. Geometric measurement and electrochemical impedance spectroscopy (EIS) technique were used to obtain the tendency of corrosion rate versus corrosion time. The growth and damage of the oxidation film on the surface of the alloy of 1cm² working area were characterized by the impedance spectra features with different corrosion time.Scanning electron microscope(SEM), energy spectrum analysis(EDX), X-ray photoelectron spectroscopy(XPS) and raman spectrum were used to analyse the constitution of corrosion product and the corrosion types. The results show that the instantaneous corrosion rate exhibits decreasing first then increasing due to the state of oxidation film. The corrosion products consist of Cu₂(OH)₃Cl and Cu₂O. And the corrosion of B10 Cu-Ni alloy starts with pitting corrosion, then gradually goes through the evolution process of intergranular corrosion to exfoliation.

Key words： B10 Cu-Ni alloy seawater corrosion EIS SEM corrosion product

收稿日期: 2015-04-15 出版日期: 2017-05-17

中图分类号:	V252.2
	TB31

基金资助:国家自然科学基金项目(37689501)

通讯作者: 张卫方 E-mail: 08590@buaa.edu.cn

作者简介: 张卫方(1970-), 男, 教授, 博士后, 现从事材料失效分析方向与研究, 联系地址:北京市海淀区学院路37号为民楼(100191), E-mail:08590@buaa.edu.cn

引用本文:

刘天娇, 陈惠鹏, 张卫方, 娄伟涛. B10铜镍合金海水加速腐蚀行为[J]. 材料工程, 2017, 45(5): 31-37.
Tian-jiao LIU, Hui-peng CHEN, Wei-fang ZHANG, Wei-tao LOU. Accelerated Corrosion Behavior of B10 Cu-Ni Alloy in Seawater. Journal of Materials Engineering, 2017, 45(5): 31-37.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.000411 或 http://jme.biam.ac.cn/CN/Y2017/V45/I5/31

Table 1 B10铜镍合金化学成分(质量分数/%)

Fig.1 B10试样平均腐蚀速率随时间变化趋势

Fig.2 B10铜镍合金腐蚀初期的表面微观形貌 (a)2h；(b)8h；(c)72h；(d)168h

Table 2 B10铜镍合金表面能谱分析结果(质量分数/%)

Fig.3 B10铜镍合金在不同腐蚀周期下腐蚀产物XPS Cu 2p窄谱扫描图

Fig.4 B10铜镍合金腐蚀拉曼光谱 (a)7d；(b)14d；(c)28d

Fig.5 B10试样海水腐蚀不同周期后的表面微观形貌(酸洗后)(a)7d；(b)14d；(c)28d；(d)56d

Fig.6 B10铜镍合金海水腐蚀不同时间的Nyquist图(1) 及其等效电路图(2) (a)2h~7d；(b)7~28d

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