开发环境友好型缓蚀剂是缓蚀剂技术发展的必然趋势,从天然物中提取有效成分作为缓蚀剂就是途径之一,采用气相缓蚀剂可以有效减轻腐蚀,适应可持续发展的要求.用酸化浸取法从米糠中提取植酸,复配成了气相缓蚀剂;采用失重、极化曲线和阻抗测试等评价了该缓蚀剂的气相缓蚀效率,并对其缓蚀机理进行了初步探讨.结果表明:该缓蚀剂对碳钢的气相腐蚀有良好的缓蚀效果,缓蚀率可达97%;该缓蚀剂为阳极吸附型缓蚀剂,符合Langmuir吸附等温式.
Phytic acid was extracted from rice bran by leaching in a dilute acid.The resulting phytic acid was used as a main component to formulate a vapor phase inhibitor.The inhibition performance of the inhibitor for carbon steel in 3 % brine was investigated by conducting weight loss test and measurement of polarization curves and electrochemical impedance spectra.The inhibition mechanism of the inhibitor was also discussed.Results show that the corrosion inhibitor has good inhibition action for carbon steel subjected to vapor phase corrosion,and an inhibition efficiency of as much as 97% is obtained.As a kind of anodic adsorption inhibitor,the vapor phase inhibitor based on phytic acid is able to prohibit anode process and obeys the Langmuir's adsorption equation.
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