硫硼酸阳极氧化处理的7050铝合金在工业海洋大气中的腐蚀行为

doi:10.11902/1005.4537.2016.169

中国腐蚀与防护学报

2016, Vol. 36

Issue (6): 580-586 DOI: 10.11902/1005.4537.2016.169

研究报告

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硫硼酸阳极氧化处理的7050铝合金在工业海洋大气中的腐蚀行为

白子恒^1,²,黄运华^1,²,李晓刚^1,^2,³,杨浪^1,²,董超芳^1,²,颜利丹^1,²,肖葵^1,²(

)

1. 北京科技大学腐蚀与防护中心北京 100083
2. 北京科技大学新材料技术研究院北京 100083
3. 中国科学院宁波材料技术与工程研究所宁波 315201

Environmental Corrosion in Industrial-marine Atmosphere at Qingdao of 7050 Al-alloy Anodized in Boric- and Sulfuric-acid Electrolyte

Ziheng BAI^1,²,Yunhua HUANG^1,²,Xiaogang LI^1,^2,³,Lang YANG^1,²,Chaofang DONG^1,²,Lidan YAN^1,²,Kui XIAO^1,²(

)

1. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
2. Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
3. Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China;

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摘要:

通过青岛大气暴露实验,对比了未处理和经硫硼酸阳极化处理的7050铝合金在典型工业海洋大气环境中的腐蚀行为。采用失重法获得腐蚀速率;使用扫描电镜对腐蚀产物进行微观形貌观察;使用EDS和XRD对腐蚀产物进行元素分析和相组成分析;运用电化学阻抗法对腐蚀产物层及氧化膜层的保护作用进行分析。结果表明：未处理的7050铝合金暴露2 a后,产生了大面积的剥蚀,腐蚀产物主要为Al(HSO₄)₃6H₂O,Al₄SO₄ (OH)₁₀5H₂O和NaAlSi₃O₈。硫硼酸阳极化处理的7050铝合金在青岛大气中暴露2 a后,局部出现点蚀,氧化膜对基体仍有良好的保护作用。硫硼酸阳极氧化预处理可以大幅度提高7050铝合金的耐蚀性。

关键词 ：大气腐蚀, 阳极化铝合金, 工业海洋大气, 7050铝合金

Abstract：

Corrosion behavior of 7050 Al-alloy, which was pre- anodized in electrolyte of boric-and sulfuric-acid, was assessed through field exposure in industrial-marine atmosphere for 2 a at Qingdao area. The corrosion rate was acquired from the relevant mass-lost data. The surface morphology, distribution of elements and the phase compositions of corrosion products were characterized by SEM, EDS and XRD, as well as the protectiveness of product scale and anodic film was evaluated by using EIS. It is indicated that the bare Al suffered from severe exfoliation corrosion with annual corrosion rate of 5.92 μma^-1, and its corrosion product mainly consists of Al(HSO₄)₃6H₂O, Al₄SO₄(OH)105H₂O and NaAlSi₃O₈; the formed corrosion product scale on the bare Al can provide protectiveness to the substrate to some extent, however, the anodized film can provide much better protectiveness in comparison with the formed oxide scale on bare Al.

Key words： atmospheric corrosion anodized aluminum alloy industrial marine atmosphere 7050 aluminum alloy

基金资助:国家重点基础研究发展计划项目 (2014CB643300) 和国家材料环境腐蚀平台资助

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引用本文:

白子恒,黄运华,李晓刚,杨浪,董超芳,颜利丹,肖葵. 硫硼酸阳极氧化处理的7050铝合金在工业海洋大气中的腐蚀行为[J]. 中国腐蚀与防护学报, 2016, 36(6): 580-586.
Ziheng BAI, Yunhua HUANG, Xiaogang LI, Lang YANG, Chaofang DONG, Lidan YAN, Kui XIAO. Environmental Corrosion in Industrial-marine Atmosphere at Qingdao of 7050 Al-alloy Anodized in Boric- and Sulfuric-acid Electrolyte. Journal of Chinese Society for Corrosion and protection, 2016, 36(6): 580-586.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.169 或 https://www.jcscp.org/CN/Y2016/V36/I6/580

表1 青岛环境参数及污染物含量

表2 未处理与经硫硼酸阳极化处理的7050铝合金在青岛大气暴露不同时间后的腐蚀速率

图1 未处理与经硫硼酸阳极化7050铝合金不同暴露实验周期的腐蚀表面宏观形貌

图2 未处理与硫硼酸阳极化7050铝合金的腐蚀产物微观形貌

图3 除锈后未处理与硫硼酸阳极化7050铝合金的表面微观形貌

表3 未处理与硫硼酸阳极化7050铝合金腐蚀产物的EDS分析

图4 未处理7050铝合金暴露2 a的腐蚀产物XRD谱

图5 未处理与硫硼酸阳极化7050铝合金的Bode图及其拟合曲线

图6 未处理和经硫硼酸阳极化7050铝合金的等效电路图

表4 未处理和经硫硼酸阳极化铝合金的电化学拟合参数

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