酸性氯化钠溶液中硝酸钠和硫脲对<strong>7075</strong>铝合金缝隙腐蚀的协同缓蚀作用

doi:10.11902/1005.4537.2022.365

中国腐蚀与防护学报

2023, Vol. 43

Issue (6): 1367-1374 CSTR: 32134.14.1005.4537.2022.365 DOI: 10.11902/1005.4537.2022.365

研究报告

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酸性氯化钠溶液中硝酸钠和硫脲对7075铝合金缝隙腐蚀的协同缓蚀作用

吕正平, 李缘, 刘晓航, 崔中雨, 崔洪芝, 王昕, 逄昆(

), 李燚周(

)

中国海洋大学材料科学与工程学院青岛 266100

Synergistic Inhibition Effect of Thiourea and Sodium Nitrate on Crevice Corrosion of 7075 Al-alloy in Acidic Sodium Chloride Solution

LYU Zhengping, LI Yuan, LIU Xiaohang, CUI Zhongyu, CUI Hongzhi, WANG Xin, PANG Kun(

), LI Yizhou(

)

School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China

引用本文:

吕正平, 李缘, 刘晓航, 崔中雨, 崔洪芝, 王昕, 逄昆, 李燚周. 酸性氯化钠溶液中硝酸钠和硫脲对7075铝合金缝隙腐蚀的协同缓蚀作用[J]. 中国腐蚀与防护学报, 2023, 43(6): 1367-1374.
Zhengping LYU, Yuan LI, Xiaohang LIU, Zhongyu CUI, Hongzhi CUI, Xin WANG, Kun PANG, Yizhou LI. Synergistic Inhibition Effect of Thiourea and Sodium Nitrate on Crevice Corrosion of 7075 Al-alloy in Acidic Sodium Chloride Solution[J]. Journal of Chinese Society for Corrosion and protection, 2023, 43(6): 1367-1374.

全文: PDF(8660 KB) HTML

摘要:

通过失重测量、电化学测试和扫描电镜 (SEM) 研究了酸性氯化钠溶液中硝酸钠 (NaNO₃) 和硫脲 (TU) 对铝合金缝隙腐蚀行为的影响。结果表明，酸性氯化钠溶液中NaNO₃和TU对铝合金的腐蚀均有一定的抑制作用，二者同时存在时表现出良好的协同抑制效应。当试样表面存在缝隙结构时，NaNO₃能抑制缝隙外铝合金的腐蚀，然而却促使缝隙内铝合金发生了严重的腐蚀，这主要是因为缝隙内NO₃^-还原产生的次生产物NH₃能够选择性溶解铝合金的富铜相，诱导点蚀萌生，进而引发缝隙腐蚀。在含有TU的腐蚀介质中，缝隙内金属的腐蚀比较轻微，但是TU对缝隙外的抑制作用较差，缝隙外铝合金仍然发生明显的腐蚀现象。同时加入TU和NaNO₃时，TU能吸附在铝合金表面，形成的保护膜能阻碍腐蚀性离子及NH₃与铝合金接触，从而抑制缝隙内腐蚀的发生，同时NaNO₃能够促进缝隙外金属表面钝化膜的形成，从而有效抑制缝隙外金属的腐蚀。因此，TU和NaNO₃对铝合金缝隙腐蚀具有协同抑制效应。

关键词 ：铝合金, 缓蚀剂, 缝隙腐蚀, 协同效应

Abstract：

The effect of NaNO₃ and TU on the crevice corrosion of 7075 Al-alloy were investigated by mass loss measurements, electrochemical tests and scanning electron microscopy (SEM) in acidic sodium chloride solution. NaNO₃ and TU show a certain inhibited effect on the corrosion of Al-alloy, respectively. Moreover, NaNO₃ and TU could inhibit synergistically the corrosion of aluminum alloy. For the specimen with crevice, NaNO₃ could inhibit the corrosion of specimen outside crevice. However, it could promote the corrosion of specimen inside crevice. It could be attributed to that the produced NH₃ inside crevice due to the reduction of nitrate could selectively dissolve the intermetallic particles and induce the nucleation of pitting corrosion inside crevice. In the solution containing TU, the specimen inside crevice is hardly corroded, however, the specimen outside crevice is still seriously corroded. In the solution with NaNO₃ and TU, the TU could adsorb on metal surface and inhibit the pitting corrosion inside crevice, while the NaNO₃ could promote the formation passive film and inhibit the corrosion of specimen outside crevice.

Key words： Al-alloy corrosion inhibitor crevice corrosion synergistic effect

收稿日期: 2022-11-21 32134.14.1005.4537.2022.365

ZTFLH:

TG172

基金资助:国家自然科学基金(51901217)

通讯作者: 李燚周，E-mail: liyizhou@ouc.edu.cn，研究方向为材料腐蚀与防护;
逄昆，E-mail: pangkun@ouc.edu.cn，研究方向为材料腐蚀与防护

Corresponding author: LI Yizhou, E-mail: liyizhou@ouc.edu.cn;
PANG Kun, E-mail: pangkun@ouc.edu.cn

作者简介: 吕正平，女，1991年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2022.365 或 https://www.jcscp.org/CN/Y2023/V43/I6/1367

图1 缝隙装置图

图2 7075铝合金在含1% NaCl的pH=1溶液中添加不同缓蚀剂的极化曲线

图3 7075-T651铝合金在不同溶液中的Nyquist图和相应的拟合电路

表1 7075铝合金在不同溶液中的电化学阻抗拟合参数

表2 7075铝合金在不同溶液中浸泡24 h后的失重结果

图4 7075在不同溶液中浸泡24 h的宏观形貌、3D轮廓图和微观形貌

图5 7075铝合金在不同溶液中浸泡24 h的缝隙内外的电位变化曲线

图6 7075铝合金在不同溶液中浸泡24 h后缝隙内外的宏观形貌和微观形貌

图7 7075铝合金在不同溶液中的缝隙腐蚀机理图

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