Effects of scratching on corrosion and stress corrosion cracking of Alloy 690TT at 58 degrees C and 330 degrees C

作者：Fandi Meng, J. Q. Wang, En–Hou Han, Wei Ke · 年份：2009 · 被引用次数：3 · 研究领域：Metal and Thin Film Mechanics、Hydrogen embrittlement and corrosion behaviors in metals、Welding Techniques and Residual Stresses

Scratched Alloy 690TT were characterized using X-ray stress analysis technique, nano-indentation, SEM, electrochemical and immersion tests. The stresses adjacent to the scratches, which resulted from scratching, were tensile parallel to the scratches and compressive perpendicular to the scratches. In the acidic sodium chloride solution at 58 degrees C, scratching caused E(corr) to shift negatively owing to a transient anodic current accompanied by a larger difference between E(corr) and the potential of zero charge. Pit 330 degrees C in the lead-containing caustic solutions, SCC initiated at the scratch-banks and scratch-beds after 30 days' immersion. Scratched Alloy 69017 exhibited both IGSCC and TGSCC in initiation. (C) 2009 Elsevier Ltd. All rights reserved.