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Protective Effects of 2-Thioquinazolin-4-One Derivatives on Steel 20 in Various Corrosive Media |
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30.09.2008 г. |
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Protective Effects of 2-Thioquinazolin-4-One Derivatives on Steel 20 in Various Corrosive Media O. I. Sizaya, O. L. Gumenyuk, and L. Yu. Chumakova Chernigov State Technological University, ul. Shevchenko 95, Chernigov, 14027 Ukraine e-mail: verv@ mail.cn.ua Received May 20, 2004 Abstract — The dependence of the inhibitive effects of new 2-thioquinazolin-4-one derivatives on the corrosivity and pH of the medium was studied. The test compounds were found to effectively inhibit the acid corrosion of steel 20; when combined with (NH4)2MoO4 , 2-thioquinazolin-4-one derivatives inhibit both the cathodic and anodic processes of electrochemical corrosion in neutral (0.3 to 0.6% NaCl) and alkaline media (0.1 M NaOH). In 3% NaCl, the test compounds stimulated corrosion.
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