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一、前言 随着工业现代化的不断发展,低合金超高强材料正在得到广泛地应用。但是由于这种材料对应力腐蚀断裂(SCC)比较敏感,目前已引起了国内外不少学者的广泛注意,对于SCC的研究,许多报告从不同方面、不同角度进行了探讨。本文主要想从国内低合金超高强度钢30CrMnSiNi2A在3.5％NaCl水溶液中SCC裂纹内部的电化学行为(裂纹内部的溶液PH值、裂纹尖端区电极电位、裂纹内部的电位分布)出发,探讨该材料在阴极极化、阳极极化、开路条件下的SCC机制。
I. Introduction With the continuous development of industrial modernization, low-alloy ultra-high-strength materials are being widely used. However, due to its sensitivity to SCC, it has attracted a great deal of attention from scholars at home and abroad. Many reports on SCC have been explored from different aspects and from different perspectives. This paper mainly from the domestic low-alloy ultra-high strength steel 30CrMnSiNi2A in 3.5% NaCl aqueous solution SCC crack electrochemical behavior of the internal (crack internal solution PH value, crack tip electrode potential, potential distribution within the crack) to explore the material SCC mechanism under cathodic polarization, anodic polarization, open circuit conditions.