某些奥氏体球墨铸铁的耐腐蚀性和其他实用特性

Alan Vaško , Viera Zatkalíková , Juraj Belan , Milan Uhríčik , Václav Kaňa
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引用次数: 0

摘要

本研究旨在评估所选奥氏体球墨铸铁的耐腐蚀性和其他实用特性,并将其与其他(非奥氏体)球墨铸铁进行比较。研究选择了两种奥氏体球墨铸铁:镍锰球墨铸铁 EN-GJSA-XNiMn13-7 和镍铬球墨铸铁 EN-GJSA-XNiCr20-2。通过机械测试评估了基本机械性能,如屈服强度、抗拉强度、伸长率、吸收能量和硬度。疲劳极限是通过低频疲劳试验确定的。平均腐蚀速率、腐蚀电位和腐蚀电流密度等腐蚀特性是通过暴露浸泡试验和电化学电位极化试验确定的。这两项腐蚀试验都是在室温下的 3.5% 氯化钠溶液(模拟海水)中进行的。机械、疲劳和腐蚀试验结果表明,与非奥氏体球墨铸铁相比,奥氏体球墨铸铁的强度和疲劳性能较低,但塑性和耐腐蚀性能明显较高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Corrosion resistance and other utility properties of selected austenitic nodular cast irons

This study deals with the evaluation of corrosion resistance and other utility properties of selected austenitic nodular cast irons and their comparison with other (non-austenitic) nodular cast irons. For the investigations, two types of austenitic nodular cast iron were selected: nickel-manganese nodular cast iron EN-GJSA-XNiMn13-7 and nickel-chromium nodular cast iron EN-GJSA-XNiCr20-2. Basic mechanical properties, such as yield strength, tensile strength, elongation, absorbed energy and hardness, were evaluated using mechanical tests. The fatigue limit was determined using low-frequency fatigue tests. Corrosion properties, such as average corrosion rate, corrosion potential and corrosion current density, were determined by the exposure immersion test and the electrochemical potentiodynamic polarisation test. Both corrosion tests were performed in a 3.5% NaCl solution (to simulate seawater) at room temperature. The results of mechanical, fatigue and corrosion tests show that austenitic nodular cast irons have lower strength and fatigue properties but significantly higher plastic properties and corrosion resistance compared to non-austenitic nodular cast irons.

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