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首页> 美国政府科技报告 >Effect of Sulfuric Acid, Oxygen, and Hydrogen in High-Temperature Water on Stress Corrosion Cracking of Sensitized Type 304 Stainless Steel
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Effect of Sulfuric Acid, Oxygen, and Hydrogen in High-Temperature Water on Stress Corrosion Cracking of Sensitized Type 304 Stainless Steel

机译：高温水中硫酸，氧和氢对敏化304不锈钢应力腐蚀开裂的影响

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The influence of dissolved oxygen and hydrogen and dilute sulfuric acid in 289 exp 0 C water on the stress-corrosion-cracking susceptibility of lightly and moderately sensitized Type 304 stainless steel was determined in constant-extension-rate tensile (CERT) tests. The CERT parameters and the fracture surface morphologies were correlated with the concentrations of dissolved oxygen and sulfate, and the electrochemical potentials of platinum and Type 304 stainless steel electrodes in simulated boiling-water reactor (BWR) environments. A particularly high susceptibility to intergranular cracking was found for the steel in the lightly sensitized condition at oxygen concentrations between approx. 0.05 and 0.2 ppM under slightly acidic conditions (pH approx. 6.0 at 25 exp 0 C), which may, in part, account for the pervasive nature of intergranular cracking in BWR piping systems. Scanning-transmission electron microscopy analyses revealed significant differences between samples in the lightly and the moderately sensitized condition with respect to the width, but not the depth, of the chromium-depleted region at the grain boundaries. The addition of 0.5 ppM hydrogen to the water had only a small mitigating effect on intergranular cracking in water containing oxygen and sulfuric acid at low concentrations; however, oxygen suppression to less than or equal to 0.05 ppM in the reactor-coolant water, by means of hydrogen additions to the feedwater, would be quite beneficial provided impurities are also maintained at very low levels. (ERA citation 09:016319)

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