自组装PFOA分子膜对带锈Q235钢腐蚀行为影响

doi:10.11902/1005.4537.2016.217

中国腐蚀与防护学报

2018, Vol. 38

Issue (1): 81-86 DOI: 10.11902/1005.4537.2016.217

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自组装PFOA分子膜对带锈Q235钢腐蚀行为影响

左银泽¹, 许宝华², 朱桂生², 黄诚², 冯清¹, 陈亮¹, 李照磊¹, 高延敏¹(

)

1 江苏科技大学材料科学与工程学院镇江 212003
2 江苏索普 (集团) 有限公司镇江 212006

Influence of Surface-active Agent PFOA Molecular Film on Rust Removal and Corrosion Behavior of Rusty Carbon Steel

Yinze ZUO¹, Baohua XU², Guisheng ZHU², Cheng HUANG², Qing FENG¹, Liang CHEN¹, Zhaolei LI¹, Yanmin GAO¹(

)

1 School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
2 Jiangsu SOPO Company, SOPO Co., Ltd., Zhenjiang 212006, China

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摘要:

使用全氟辛酸铵 (PFOA) 作为锈层处理剂,研究了PFOA浓度变化对清洗带锈Q235钢表面锈层效果和Q235钢腐蚀行为的影响。使用EDS、SEM分析技术以及接触角、电化学极化曲线和电化学阻抗等测试方法对经1,10,100,150和200 g/L的PFOA溶液处理后Q235钢表面的化学结构、基本组成、表面形貌、润湿性和耐腐蚀性等进行表征。结果表明：PFOA溶液具有扩散性和润湿性,并能透过多孔锈层渗透到基材表面,与表面Fe离子发生配位作用,通过分子自组装的方式形成分子膜。该吸附膜破坏了锈层和基材的结合,有利于锈层的清理。PFOA浓度为150 g/L时的除锈效果最好;相比于空白样品,表面锈层基本消失,接触角增大111.9%,CuSO₄点滴实验变色时间延长70%,腐蚀电流降低53.3%,表面膜容抗电阻增加193%。

关键词 ： PFOA分子膜, 带锈表面, 表面处理, 电化学

Abstract：

High surface-active ammonium perfluorooctanoic acid (PFOA) was selected as a surface treatment agent, and the influence of the concentration of PFOA on the rust removal effect for the rust scale and the corrosion behavior of the cleaned Q235 steel was investigated. The rust Q235 steel samples were derust in solutions with 1, 10, 100, 150 and 200 g/L PFOA respectively, and which then were characterized by means of contact angle measurement, electrochemical polarization curve measurement, and electrochemical impedance spectroscopy and SEM with EDS . Results show that PFOA solution has great speadability and wettability for the surface of rust steel and can penetrate the porous rust scale to the substrate surface to form adsorption film, which can weaken and even destroy the bonding between the rust and the substrate, thereby the rust can easy spall off. Among others the solution with 150 g/L PFOA presented the best derusting efficiency, i.e. the rust scale was completely removed, correspondingly the contact angle, the time of corrosion occurrence by copper sulfate drop test and electrochemical impedance all increased by 111.9%, 70% and 193% respectively, while the corrosion current decreased by 53.3% for the derust steel in comparison with the reference one.

Key words： PFOA molecular film rusty surface surface treatment electrochemical

收稿日期: 2016-11-07

ZTFLH:

TG17

基金资助:国家自然科学基金 (51075197),江苏省产学研前瞻 (BY2013066-12) 和江苏科技大学研究生创新基金 (YCX11S-24)

作者简介: 作者简介左银泽,男,1992年生,硕士生

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引用本文:

左银泽, 许宝华, 朱桂生, 黄诚, 冯清, 陈亮, 李照磊, 高延敏. 自组装PFOA分子膜对带锈Q235钢腐蚀行为影响[J]. 中国腐蚀与防护学报, 2018, 38(1): 81-86.
Yinze ZUO, Baohua XU, Guisheng ZHU, Cheng HUANG, Qing FENG, Liang CHEN, Zhaolei LI, Yanmin GAO. Influence of Surface-active Agent PFOA Molecular Film on Rust Removal and Corrosion Behavior of Rusty Carbon Steel. Journal of Chinese Society for Corrosion and protection, 2018, 38(1): 81-86.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.217 或 https://www.jcscp.org/CN/Y2018/V38/I1/81

图1 Q235钢表面腐蚀产物的SEM像和EDS结果

图2 Q235钢表面腐蚀产物的XRD谱

图3 带锈Q235钢试样经去离子水和不同浓度PFOA溶液浸泡后的宏观形貌

图4 带锈Q235钢试样经去离子水和不同浓度PFOA溶液浸泡后的表面微观形貌左银泽等：自组装PFOA分子膜对带锈Q235钢腐蚀行为影响

图5 带锈Q235钢试样经去离子水和不同浓度PFOA溶液浸泡后的极化曲线

表1 带锈Q235钢试样经去离子水和不同浓度PFOA溶液浸泡后的腐蚀电位和腐蚀电流密度

图6 带锈Q235钢试样经去离子水和不同浓度PFOA溶液浸泡后的电化学阻抗谱

图7 带锈Q235钢试样经去离子水和不同浓度PFOA溶液浸泡后的等效电路图

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