Alternative TitleResearch Progress on Sulfur-Induced Corrosion of Alloys 690 and 800 in High Temperature and High Pressure Water
夏大海1; 宋诗哲1; 王俭秋2; 骆静利3
Source Publication金属学报
Other AbstractAs nuclear power operates at high temperature and high pressure, corrosion is considered as one of the issues that threaten the safe operation, though corrosion rarely occurs. To fully understand the electrochemical behavior of nuclear key materials and manage the corrosion degradation of these materials in a proactive manner, a great deal of work have been undertaken in tab. Some sulfurrelated specie can cause corrosion degradation of metal materials. Steam generator (SG) is one of the most important components in nuclear power plant, and alloys 800 and 690 are the most frequently used as SG tubing alloys. Sulfur-induced corrosion of SG alloys in high temperature and high pressure water is one of the most complicated processes. In this paper, the research progress regarding to sulfur-induced corrosion of alloys 690 and 800 was reviewed from the aspects of thermodynamic calculations and experimental. Thermodynamic calculations are mainly presented by E-pH diagrams, volt equivalent diagrams and species distribution curves. It is concluded that the valences of sulfur and their interactions with metal is mainly affected by temperature, solution pH and electrode potential. Experimental data indicate that sulfur induced corrosion is determined by temperature, solution pH, sulfur species, and other impurities like chloride ions, grain orientation, alloy compositions and stress etc. These factors can interact in a very complicated way. Generally, increasing temperature and decreasing solution pH would increase the corro- sion degree of SG tubing alloys. Sulfur at the reduced or intermediate oxidation level are more detrimental than complete oxidation level, to the passivity of SG tubing alloys. Chloride ions have a combined ef- fect with thiosulfate on passive film degradation in the case that chloride's adsorption is dominant; this combined effect is not remarkable if the chloride's adsorption is not dominant. Elements like Cr, Mo and Cu in alloys would weaken sulfur adsorption to some extent and therefore inhibit sulfur-induced corrosion, but increasing Ni content would enhance sulfur-induced corrosion. Both compressive and tensile stress would increase the reactivity of a passive surface of SG tubing. Sulfur would more easily adsorb on the metal surface where it has more defects, resulting in an increased dissolution rate. The crystal ori- entation can enhance the corrosion rate in the order of (111)〈(100)〈(110).
Keyword蒸汽发生器 690合金 800合金 硫代硫酸根 还原态硫 钝化膜
Indexed ByCSCD
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Cited Times:5[CSCD]   [CSCD Record]
Document Type期刊论文
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GB/T 7714
夏大海,宋诗哲,王俭秋,等. 690和800合金在高温高压水中硫致腐蚀失效研究进展[J]. 金属学报,2017,53.0(012):1541-1554.
APA 夏大海,宋诗哲,王俭秋,&骆静利.(2017).690和800合金在高温高压水中硫致腐蚀失效研究进展.金属学报,53.0(012),1541-1554.
MLA 夏大海,et al."690和800合金在高温高压水中硫致腐蚀失效研究进展".金属学报 53.0.012(2017):1541-1554.
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