Role of Hydroxyl Group in the Inhibitive Action of Benzoic Acid Toward Corrosion of Aluminum in Nitric Acid
Role of Hydroxyl Group in the Inhibitive Action of Benzoic Acid Toward Corrosion of Aluminum in Nitric Acid
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DOI：
10.5006/1.3283929
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发表时间：
1999-10
期刊：
影响因子：
1.6
通讯作者：
P. Yadav;A. Singh;R. Wadhwani
中科院分区：
文献类型：
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作者：
P. Yadav;A. Singh;R. Wadhwani
摘要采用不同浓度的苯甲酸、对羟基苯甲酸、2-4-二羟基苯甲酸和3-4-5-三羟基苯甲酸在30% （wt%）硝酸（HNO3）中对铝合金3003 （UNS A93003）的缓蚀作用进行了研究，温度分别为30℃、40℃和50℃。3-4-5-三羟基苯甲酸（抑制率[IE]分别为30%和72%）是最有效的抑制剂，其次是2-4-二羟基苯甲酸（IE: 22% ~ 62%）、对羟基苯甲酸（IE: 11% ~ 52%）和苯甲酸（IE: 2.5% ~ 15%）。IE随着浓度的增加而增加，在所有抑制剂浓度为0.5%时观察到其最大值。从30°C到50°C，抑制剂的IE百分比随着温度的升高而降低。根据失重数据计算了热吸附值和活化能，得出了在表面发生反应的范围。所研究的抑制剂的行为偏离Langmuir等温线。较高羟基的IE…
Abstract Corrosion inhibition action of benzoic acid, p-hydroxy benzoic acid, 2-4-dihydroxy benzoic acid, and 3-4-5-trihydroxy benzoic acid toward aluminum alloy 3003 (UNS A93003) in 20% (wt%) nitric acid (HNO3) using different concentrations of these compounds at 30°C, 40°C, and 50°C has been studied thoroughly. 3-4-5-trihydroxy benzoic acid (inhibition efficiency [IE]: 30% and 72%) was the most effective inhibitor followed by 2-4-dihydroxy benzoic acid (IE: 22% to 62%) p-hydroxy benzoic acid (IE: 11% to 52%), and benzoic acid (IE: 2.5% to 15%). IE increased with concentration and its maximum value was observed at 0.5% concentration of all inhibitors used. The percentage of IE of the inhibitors decreased with an increase in temperature from 30°C to 50°C. Values of heat adsorption and activation energy were calculated from weight loss data, which came out in the range for the reaction occurring at the surface. The behavior of inhibitors studied deviated from the Langmuir isotherm. The IE of higher hydroxy...