Author:
Xi Yuchen,Wang Qinying,Luo Xiaofang,Zhang Xingshou,Liu Tingyao,Zheng Huaibei,Dong Lijin,Wang Jie,Zhang Jin
Abstract
Purpose
The purpose of this paper is to investigate the effect Ti on stress corrosion cracking (SCC) and flow accelerated stress corrosion cracking (FA-SCC) behavior and mechanisms of Monel K500 alloy.
Design/methodology/approach
Monel K500 alloy with different Ti contents was designed. A metallurgical microscope (XJP-3C) and scanning electron microscopy (EV0 MA15 Zeiss) with an energy dispersive spectroscopy were used to analyze the microstructure of the Monel K500 alloy. In situ electrochemical tests were carried out in static and flowing seawater to study FA-SCC behavior.
Findings
The number of TiCN particles in the alloy increased as the increase of Ti content. The static corrosion and SCC of Monel K500 alloy are reduced as the content of Ti increases. Generally, the SCC of alloys was caused by the synergistic effect of the anodic dissolution at exposed metal matrix and the pit corrosion of metal matrix adjacent to TiCN particles, which was further accelerated by flowing.
Originality/value
The corrosion behavior and mechanism of Monel K500 alloy with different Ti contents in a complex flowing seawater environment are still unclear, which remain systematic study to insure the safe service of the alloy.
Subject
General Materials Science,General Chemical Engineering
Reference22 articles.
1. Long-term corrosion behavior of materials in the marine atmosphere;ASTM Special Technical Publication,1988
2. The analysis of electrode impedances complicated by the presence of a constant phase element;Journal of Electroanalytical Chemistry and Interfacial Electrochemistry,1984
3. The effect of TiC on the hydrogen induced ductility loss and trapping behavior of Fe-C-Ti alloys;Corrosion Science,2016
4. Precipitation in the NiCu-base alloy Monel K-500;Materials Science and Engineering,1986
5. Precipitation hardening in Nickel-Copper base alloy Monel K500;Metallurgical Transactions A,1993