用线性扫描伏特计对管道钢阴极保护应力腐蚀开裂机理的系统研究

L. Nyrkova, S. Osadchuk, P. Lisovyi, S. Prokopchuk
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引用次数: 0

摘要

提出了一种用线性扫描伏安法快速评价不同等级管线钢在阴极保护下应力腐蚀开裂机理的方法。该方法为实验室条件下不同保护电位下管道钢应力腐蚀开裂机理的电化学研究奠定了基础。测定了扫描电位快()和慢()时的极化电流比,并根据不同等级钢的极化电位对其进行了分析。结果表明,裂纹尖端与其他表面腐蚀速率差最大的极化电位值(最大值)和应力腐蚀裂纹的快速发展在不同等级钢中是不同的,在X70钢-0.75 V、09G2S钢-0.85 V和17G1S钢-0.8 V附近均相等。建立了模型土壤环境NS4极化电位边界,在此边界之外,所研究钢在模型土壤环境NS4中的自腐蚀机制发生了变化,即:X70从-0.75 V到-1.05 V;09G2S为-0.85 V ~ -1.0 V;从-0.8 V到-0.98 V的17G1S。这表明,在其他条件相同的情况下,SCC可能以不同的速率和模式发展。这项工作的结果可用于对SCC机制的理论理解和对土壤环境中SCC机制的明确评估,特别是在溶解涂层下的膜下电解质中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
METHODICAL APPROACH TO THE STUDY OF STRESS CORROSION CRACKING MECHANISM OF PIPELINE STEEL AT CATHODIC PROTECTION BY LINEAR SWEEP VOLTAMETRY
A methodological approach to the rapid assessment by linear sweep voltammetry method stress corrosion cracking (SCC) mechanism of pipeline steels of various grades under cathodic protection has been developed. The proposed approach serves as the basis for the electrochemical study of the mechanism of stress corrosion cracking of pipeline steel at various protective potentials for laboratory conditions. The ratio of polarization currents at fast () and slow () scanning potential rate was determined, its analysis was carried out depending on the polarization potential for steels of various grades. It was established that polarization potentials at which the difference between corrosion rate of the crack’s tip and the other surface is the maximum (maximum value of ) and the rapid development of stress corrosion cracks begin, which is differ for steels of various grades and equal near -0.75 V for X70 steel, -0.85 V for 09G2S steel and -0.8 V for 17G1S steel. The boundaries of the polarization potentials are established, beyond which the SCC mechanism of the investigated steels in the model soil environment NS4 changes, namely: from -0.75 V to -1.05 V for X70; -0.85 V to -1.0 V for 09G2S; from -0.8 V to -0.98 V for 17G1S. This indicates the possibility of SCC development with different rates and patterns, all other things being equal. The results of the work can be useful both for a theoretical understanding of the SCC mechanism and for an express assessment of the SCC mechanism in a soil environment and, in particular, in underfilm electrolyte under a disbanded coating.  
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