目的：以马来酸为原料制备2,3-二巯基丁二酸(DMSA),研究DMSA对铜在0.5 mol/L NaOH溶液中的缓蚀作用。方法以马来酸为原料,通过加成、消去、加成再水解的方法制备2,3-二巯基丁二酸,利用红外光谱和质谱对其结构进行表征。通过静态腐蚀失重实验研究铜在添加不同含量 DMSA 的NaOH溶液中的腐蚀速度,采用极化曲线和交流阻抗谱技术研究铜在添加不同含量DMSA的NaOH溶液中电化学行为,并用电子扫描电镜观察铜表面腐蚀形貌。结果红外光谱和质谱结合证明,目标产物为DMSA。铜在DMSA质量浓度分别为0,2.5,5.0 g/L的NaOH溶液中的腐蚀速率分别为7.60,3.25,2.13μg/(cm2·h)。当NaOH溶液中DMSA的质量浓度为5.0 g/L时,缓蚀率可达到94.92%。结论 DMSA在铜表面的吸附能降低水分子的侵蚀,增大铜表面的腐蚀产物膜电阻和电荷转移电阻,属于阳极型缓蚀剂。
Objective 2,3-dimercaptosuccinic acid(DMSA) was synthesized with maleic acid as raw material, to study the cor-rosion inhibition performance of DMSA on copper in 0. 5 mol/L NaOH solution. Methods DMSA was prepared by methods of addi-tion, elimination, addition and hydrolysis with maleic acid as raw material, the structure of which was then characterized by Fourier infrared spectroscopy (IR) and mass spectrometry (MS). The corrosion rates of copper in 0. 5 mol/L NaOH supplemented with different concentrations of DMSA were investigated by static weight loss tests, the corrosion inhibition performance was investigated by polarization curves and electrochemical impendence spectroscopy ( EIS) , respectively. Copper surface corrosion morphology was observed by scanning electronmicroscopy ( SEM) . Results IR and mass spectrometry jointly confirmed that the target product was DMSA. The corrosion rates of Cu in 0. 5 mol/L NaOH were 7. 60, 3. 25, 2. 13 μg/( cm2 ·h) with supplementation of 0, 2. 5, 5. 0 g/L DMSA, respectively. When the DMSA concentration in NaOH solution was 5. 0 g/L, the inhibition efficiency reached 94. 92%. Conclusion DMSA could absorb on the copper surface, decrease water erosion and increase the corrosion product film resistance and the charge transfer resistance. DMSA was an anodic inhibitor.
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