2A12铝合金锆基转化膜的制备及性能研究

doi:10.11902/1005.4537.2020.216

中国腐蚀与防护学报

2021, Vol. 41

Issue (1): 101-109 DOI: 10.11902/1005.4537.2020.216

研究报告

本期目录 | 过刊浏览

2A12铝合金锆基转化膜的制备及性能研究

于宏飞¹^,², 邵博³, 张悦¹, 杨延格²(

)

^1.沈阳工业大学材料科学与工程学院沈阳 110870
^2.中国科学院金属研究所师昌绪先进材料创新中心沈阳 110016
^3.鞍钢集团工程技术有限公司鞍山 114021

Preparation and Properties of Zr-based Conversion Coating on 2A12 Al-alloy

YU Hongfei¹^,², SHAO Bo³, ZHANG Yue¹, YANG Yange²(

)

^1.School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
^2.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.Ansteel Engineering Technology Co. , Ltd. , Anshan 114021, China

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摘要:

在2A12铝合金基体上制备了无铬锆基转化膜，对锆基转化膜的耐腐蚀性能、前处理及成膜过程中的显微形貌演变和膜层成分进行了表征，重点探究了第二相对成膜过程的影响。结果表明，基体表面第二相对锆基转化膜成膜的影响主要体现在三方面：第一，碱洗和酸洗前处理后，合金表面第二相和大量蚀坑的存在造成基体表面凹凸不平；第二，成膜过程中，第二相的存在不利于转化膜颗粒的均匀形核和长大；第三，成膜完成后，第二相被腐蚀破坏，严重影响膜层的致密性和均匀性。

关键词 ：转化膜, 锆基, 铝合金, 腐蚀, 第二相

Abstract：

A Cr-free Zr-based conversion coating (ZrCC) was prepared on 2A12 Al-alloy, which then was characterized in terms of the surface micromorphology evolution and composition of 2A12 Al-alloy during pretreatment and conversion process, especially, the influence of the second phase of the alloy on the conversion process. The results show that first, the pretreatment process resulted in a very rough surface of the 2A12 Al-alloy, on which there exist many pits and residual second phases; next, the second phase particulates in 2A12 Al-alloy were unfavorable to the uniform nucleation and growth of conversion coating granulates during conversion process; and third, after conversion process, the second phase particulates on the 2A12 Al-alloy surface were seriously destroyed, that brough strong impact on the compactness and uniformity of the coating.

Key words： conversion coating Zr-based aluminium Al-alloy corrosion second phase

收稿日期: 2020-10-27

ZTFLH:

TG174

基金资助:国家重点研发计划(2019YFC0312100);民机专项

通讯作者: 杨延格 E-mail: ygyang@imr.ac.cn

Corresponding author: YANG Yange E-mail: ygyang@imr.ac.cn

作者简介: 于宏飞，男，1996年生，硕士生

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引用本文:

于宏飞, 邵博, 张悦, 杨延格. 2A12铝合金锆基转化膜的制备及性能研究[J]. 中国腐蚀与防护学报, 2021, 41(1): 101-109.
Hongfei YU, Bo SHAO, Yue ZHANG, Yange YANG. Preparation and Properties of Zr-based Conversion Coating on 2A12 Al-alloy. Journal of Chinese Society for Corrosion and protection, 2021, 41(1): 101-109.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.216 或 https://www.jcscp.org/CN/Y2021/V41/I1/101

图1 2A12铝合金基体及ZrCC的极化曲线

图2 2A12铝合金基体与ZrCC电化学阻抗谱

图3 2A12铝合金基体与ZrCC的拟合电路

表1 2A12铝合金基体与锆基转化膜的拟合参数结果

图4 2A12铝合金SEM像及EDS面扫图像

图5 前处理过程中SEM像

图6 酸洗后不同位置EDS结果

图7 2A12铝合金在锆基转化液中OCP随浸泡时间的变化曲线

图8 2A12铝合金ZrCC在转化液中不同成膜时间的SEM形貌

图9 成膜后的SEM显微形貌

表2 ZrCC表面与截面EDS分析结果

图10 2A12铝合金ZrCC的XPS总谱

图11 2A12铝合金ZrCC中不同元素的高分辨XPS谱

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