新型高强稀土Al-Zn-Mg-Cu-Sc铝合金的阳极氧化及其抗腐蚀性能研究

doi:10.11902/1005.4537.2020.005

中国腐蚀与防护学报

2020, Vol. 40

Issue (2): 131-138 DOI: 10.11902/1005.4537.2020.005

研究报告

本期目录 | 过刊浏览

新型高强稀土Al-Zn-Mg-Cu-Sc铝合金的阳极氧化及其抗腐蚀性能研究

王英君¹, 刘洪雷¹, 王国军¹, 董凯辉², 宋影伟²(

), 倪丁瑞²

1 东北轻合金有限责任公司哈尔滨 150060
2 中国科学院金属研究所沈阳 110016

Investigation of Anodic Film on a Novel RE-containing Al-Alloy Al-Zn-Mg-Cu-Sc

WANG Yingjun¹, LIU Honglei¹, WANG Guojun¹, DONG Kaihui², SONG Yingwei²(

), NI Dingrui²

1 Northeast Light Alloy CO. , LTD, Harbin 150060, China
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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摘要:

针对添加稀土Sc的新型高强7000系铝合金中析出相的特征，发展了相应的阳极氧化工艺，并通过封孔后处理进一步提高膜层的致密性。结果表明，在7000系稀土铝合金表面存在的含Sc析出相作为微阴极，加速其周围Al基体的溶解，影响成膜均匀性。通过调整氧化溶液组成及电参数，在铝合金表面获得了均匀的阳极氧化膜。同时对比了氟锆酸盐、铈盐及沸水3种封孔工艺对阳极氧化膜耐蚀性的影响，结果显示沸水封孔后的阳极氧化膜呈银白色，膜层均匀致密，无缺陷和微裂纹存在，耐蚀性最佳，该膜层盐雾测试336 h未发生腐蚀，可以满足实际工业应用的要求。

关键词 ：稀土铝合金, 析出相, 阳极氧化, 封孔处理, 耐蚀性

Abstract：

A novel anodic process was developed for a RE-containing 7000 series Al-alloy Al-Zn-Mg-Cu-Sc. Further, sealing-pore post treatments were carried out to improve the compactness of the anodic film. The results indicate that the precipitated Sc-containing phases on the surface of 7000 series Al-alloy act as micocathodes to accelerate the corrosion of Al matrix, which has a negative effect on the uniformity of the anodic film. In order to solve this trouble, the formula and electric parameters of the electrolyte bath were adjusted, hence, a uniform and smooth anodic film is formed on the surface of the Al-alloy. Meantime, three sealing-pore processes with fluozirconate, cerate and boiling water respectively were carried out to improve the compactness of the anodic film. It is found that after boiling water sealing-pore, the anodic film exhibits a sliver like uniform surface without defects and microcracks, among others, that film presents the best corrosion resistance, and the film can keep intact after salt spray test for 336 h, which can satisfy the requirement for the actual applications.

Key words： RE aluminum alloy precipitation phase anodic film sealing-pore treatment corrosion resistance

收稿日期: 2020-01-09

ZTFLH:

TG174

基金资助:国家重点研发计划(2016YFB0301105)

通讯作者: 宋影伟 E-mail: ywsong@imr.ac.cn

Corresponding author: SONG Yingwei E-mail: ywsong@imr.ac.cn

作者简介: 王英君，男，1980年生，硕士，高级工程师

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引用本文:

王英君, 刘洪雷, 王国军, 董凯辉, 宋影伟, 倪丁瑞. 新型高强稀土Al-Zn-Mg-Cu-Sc铝合金的阳极氧化及其抗腐蚀性能研究[J]. 中国腐蚀与防护学报, 2020, 40(2): 131-138.
Yingjun WANG, Honglei LIU, Guojun WANG, Kaihui DONG, Yingwei SONG, Dingrui NI. Investigation of Anodic Film on a Novel RE-containing Al-Alloy Al-Zn-Mg-Cu-Sc. Journal of Chinese Society for Corrosion and protection, 2020, 40(2): 131-138.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.005 或 https://www.jcscp.org/CN/Y2020/V40/I2/131

图1 7000系稀土铝合金SEM背散射微观形貌

图2 7000系铝合金碱蚀后表面形貌

图3 各工艺参数对阳极氧化膜阻抗值的影响

图4 7000系铝合金阳极氧化前后在3.5%NaCl溶液中的阻抗谱对比

图5 铝合金基体表面形貌及铝合金基体和阳极氧化膜在3.5%NaCl溶液中浸泡20 h的表面形貌

图6 经3种封孔方法处理后的铝合金阳极氧化膜在3.5%NaCl溶液中的阻抗谱对比

图7 阻抗谱的等效电路图

表1 阻抗谱的拟合结果

图8 沸水封孔后铝合金阳极氧化膜的表面和截面形貌

图9 铝合金基体、未封孔及沸水封孔阳极氧化膜在3.5% NaCl溶液中的极化曲线对比

表2 极化曲线的拟合结果

图10 阳极氧化膜及其经沸水封孔、再经盐雾腐蚀336 h后的宏观形貌

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