3.5%NaCl溶液中硝基巴比妥酸对AZ31B与AZ91D镁合金腐蚀的缓蚀作用及机理研究

doi:10.11902/1005.4537.2024.301

中国腐蚀与防护学报

2025, Vol. 45

Issue (4): 916-926 CSTR: 32134.14.1005.4537.2024.301 DOI: 10.11902/1005.4537.2024.301

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3.5%NaCl溶液中硝基巴比妥酸对AZ31B与AZ91D镁合金腐蚀的缓蚀作用及机理研究

翟亚如¹, 熊金平¹, 赵景茂¹^,²(

)

1 北京化工大学材料科学与工程学院北京 100029
2 材料电化学过程与技术北京市重点实验室北京 100029

Corrosion Inhibition Performance of Nitrobarbituric Acid on Mg-alloys AZ31B and AZ91D in 3.5%NaCl Solution

ZHAI Yaru¹, XIONG Jinping¹, ZHAO Jingmao¹^,²(

)

1 College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
2 Beijing Key Laboratory of Materials Electrochemical Process and Technology, Beijing 100029, China

引用本文:

翟亚如, 熊金平, 赵景茂. 3.5%NaCl溶液中硝基巴比妥酸对AZ31B与AZ91D镁合金腐蚀的缓蚀作用及机理研究[J]. 中国腐蚀与防护学报, 2025, 45(4): 916-926.
Yaru ZHAI, Jinping XIONG, Jingmao ZHAO. Corrosion Inhibition Performance of Nitrobarbituric Acid on Mg-alloys AZ31B and AZ91D in 3.5%NaCl Solution[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(4): 916-926.

全文: PDF(18890 KB) HTML

摘要:

为了探究一种缓蚀剂对于不同型号的镁合金的缓蚀效果是否存在差异，本文采用静态失重法、析氢和电化学测试、SEM-EDS、XRD和XPS等手段对镁合金表面形成的腐蚀产物形貌、成分和元素组成进行分析，探究硝基巴比妥酸(NBA)对AZ31B和AZ91D镁合金的缓蚀作用机理。结果表明：NBA能明显抑制AZ31B镁合金在3.5% (质量分数) NaCl溶液中的腐蚀速率，而对于AZ91D镁合金则表现为促进腐蚀。NBA为酸性物质，加入3.5%NaCl溶液后，降低了溶液的pH值，初始由于AZ31B镁合金基体的溶解，基体表面产生大量Mg²⁺，与阴极反应产生的OH^-发生反应，在合金表面沉积一层致密的Mg(OH)₂保护膜，从而抑制腐蚀；而对于AZ91D镁合金，由于不能在表面快速形成致密的Mg(OH)₂保护膜，从而腐蚀加速。

关键词 ：硝基巴比妥酸, AZ31B, AZ91D, 镁合金, 缓蚀剂, 缓蚀机理

Abstract：

The inhibition performance of nitrobarbituric acid (NBA) on AZ31B and AZ91D alloys in 3.5%NaCl solution was comparatively evaluated using weight loss method, hydrogen evolution measurement, and electrochemical tests. The results revealed that NBA significantly could inhibit the corrosion of AZ31B in 3.5%NaCl solution, whereas it promoted the corrosionof AZ91D alloy. The inhibition mechanisms of NBA on the two Mg-alloys were elucidated through SEM-EDS, XRD, and XPS analyses. The acidic NBA reduced the pH value of 3.5%NaCl solution, initially dissolving Mg matrix of AZ31B alloy. For AZ31B alloy, the dissolution of the Mg matrix released Mg²⁺ ions, facilitating the formation of a dense Mg(OH)₂ scale on the alloy surface, which effectively inhibited the further corrosion. Conversely, the inherent corrosion resistance of AZ91D hindered the rapid formation of a protective scale Mg(OH)₂, allowing NBA to dissolve the substrate, thus promoting the corrosion of AZ91D alloy.

Key words： nitrobarbituric acid AZ31B AZ91D magnesium alloy corrosion inhibitors corrosion inhibition mechanism

收稿日期: 2024-09-17 32134.14.1005.4537.2024.301

ZTFLH:

TG174.42

基金资助:国家自然科学基金(52371046)

通讯作者: 赵景茂，E-mail：jingmaozhao@126.com，研究方向为材料腐蚀与防护

Corresponding author: ZHAO Jingmao, E-mail: jingmaozhao@126.com

作者简介: 翟亚如，女，2000年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.301 或 https://www.jcscp.org/CN/Y2025/V45/I4/916

表1 AZ31B在3种温度下的含1 g/L NBA的3.5%NaCl溶液中的腐蚀速率和缓蚀率

表2 AZ91D在3种温度下的含1 g/L NBA的3.5%NaCl溶液中的腐蚀速率和缓蚀率

表3 AZ31B和AZ91D在25 ℃的含有1 g/L NBA的3.5%NaCl溶液中的析氢测试结果

图1 AZ31B与AZ91D镁合金在含/不含1 g/L NBA的盐水溶液中浸泡24 h后的动电位极化曲线

表4 两种镁合金极化曲线利用CView软件拟合得到的电化学参数

图2 AZ31B镁合金在含/不含1 g/L NBA的3.5%NaCl溶液中浸泡24 h的Nyquist图、Bode图以及等效电路图

图3 AZ91D镁合金在含/不含1 g/L NBA的3.5%NaCl溶液中浸泡24 h的Nyquist图、Bode图和等效电路图

表5 AZ31B在25 ℃添加和不添加1 g/L NBA的3.5%NaCl溶液中EIS拟合参数

表6 AZ91D在25 ℃添加和不添加1 g/L NBA在3.5%NaCl溶液中EIS拟合参数

图4 AZ31B与AZ91D镁合金分别在含有1 g/L NBA的25、35和50 ℃的盐水溶液中浸泡72 h的表面腐蚀产物的XRD谱

图5 AZ31B镁合金在含有1 g/L NBA的3.5%NaCl溶液中分别浸泡24、48和72 h的SEM图

图6 AZ31B镁合金在含有1 g/L NBA的3.5%NaCl溶液中浸泡72 h的EDS图谱

图7 AZ91D镁合金在含有1 g/L NBA的3.5%NaCl溶液中分别浸泡24、48和72 h的SEM图

图8 AZ31B镁合金在含有1 g/L NBA的3.5%NaCl溶液中浸泡72 h的EDS图谱

图9 AZ31B镁合金在25 ℃的含有1 g/L NBA的3.5% NaCl溶液中浸泡72 h后的截面SEM图像

图10 AZ31B和AZ91D镁合金在50 ℃的含有1 g/L NBA的3.5%NaCl溶液中浸泡72 h后得到的XPS全谱

图11 AZ31B镁合金试样在50 ℃的含有1 g/L NBA的3.5%NaCl溶液中浸泡72 h后得到的XPS高分辨谱

表7 AZ31B和AZ91D在35 ℃下的含有1 g/L NBA的3.5%NaCl溶液中浸泡不同时间时的溶液pH值

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