物理化学学报Issue(3)：467-475,9.DOI:10.3866/PKU.WHXB201501053
690合金在300°C含硫模拟碱性水化学中的腐蚀行为
Corrosion Behavior of Alloy 690 in Simulated Alkaline Water Chemistries Containing Sulfur at 300 °C
摘要
Abstract
Al oy 690 is one of the steam generator (SG) tubing materials in pressurized water reactors (PWR). The degradation of this al oy in alkaline solutions containing reduced sulfur is one of the main causes of stress corrosion cracking. In this study, the corrosion behavior of Al oy 690 in simulated alkaline crevice chemistry at 300 ° C was investigated using polarization curves, scanning electron microscopy (SEM), Auger electron spectroscopy (AES), and time-of-flight secondary ion mass spectrometry (ToF-SIMS). Studying the effect of thiosulfate and sulfate on the properties of the passive film formed on Al oy 690 showed that the film formed at 300 °C was composed of an outer porous layer and an inner compact layer, and that the ion species presented in chloride solutions had a significant impact on the corrosion behavior of the al oy. The addition of thiosulfate increased the passive current density, decreased the transpassive potential, and therefore lowered the corrosion resistance. The presence of thiosulfate also led to a decrease in Cr levels and an increase in Ni levels in the passive layer. The thiosulfate can reduce sulfur at the film surface and enter into the film, causing an increased sulfide content in the film which decreases the corrosion resistance. However, experiments using sulfate had no obvious effect on film degradation as the ion had minimal interaction with the film.关键词
690合金/钝化膜/碱性/硫代硫酸根/硫酸根Key words
Al oy 690/Passive film/Alkaline/Thiosulfate/Sulfate分类
化学化工引用本文复制引用
夏大海,LUO Jing-Li..690合金在300°C含硫模拟碱性水化学中的腐蚀行为[J].物理化学学报,2015,(3):467-475,9.基金项目
The project was supported by the Atomic Energy of Canada Limited (AECL)@@@@加拿大原子能公司资助项目 （AECL）
