摘要
通过现场实验(1,2和2.5 a)和电化学阻抗谱(EIS)的测试,并结合腐蚀形貌宏观观察,SEM,XRD及失重法对Q235钢在北京土壤环境中的腐蚀行为及机理进行了研究。结果表明:现场埋样1,2和2.5 a的Q235钢的腐蚀特征均表现为全面腐蚀,且局部点蚀程度严重。随埋样时间的延长,Q235钢的腐蚀速率先增加后略有减小,其平均点蚀深度和最大点蚀深度均增加。腐蚀产物均主要由α-FeOOH,β-FeOOH,γ-FeOOH及γ-Fe2O3组成。随埋样时间的延长,α-FeOOH相对含量有所增加,腐蚀产物层的致密性及连续性有所改善,但腐蚀产物层不具有良好的保护性。
The corrosion behavior of the Q235 carbon steel in Beijing soil environment was investigated by burying test in nature field for one year, two years and two point five years, electrochemical impedance spectroscopy（EIS） test, morphology observations, and weight-loss method. The results showed that the general corrosion occurred mainly on the Q235 carbon steel in Beijing soil, but the serious pitting corrosion was observed locally. With the increase of burying time, the average depth of pitting and the deepest depth of pitting both increased, while the corrosion rate increased first and then decreased. The corrosion product of the Q235 carbon steel mainly consisted of α-FeOOH, β-FeOOH, γ-FeOOH, and γ-Fe2O3. With the increase of burying time, the content of α-FeOOH increased, meanwhile the compactness and continuity of the corrosion product layer improved, but it could not protect the substrate.
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2013年第3期199-204,共6页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金重点项目(51131001)
国家自然科学基金项目(50971016)
中央高校基本科研业务费专项资金项目(FRF-TP-09-029B)资助
