321不锈钢在低酸度硝酸铀酰溶液中的腐蚀特性

Corrosion Behavior of 321 Stainless Steel in Low-Acidity Uranium Nitrate Solution

用称量法和电化学法研究了321不锈钢在不同浓度和pH值的硝酸铀酰溶液中的高温均匀腐蚀和电化学腐蚀行为.均匀腐蚀试验结果表明,在选定的腐蚀条件下,321不锈钢样品在960h内,其表面光洁度无明显变化,腐蚀速率小于0.04g/m2.h,在低酸度的硝酸铀酰溶液中耐蚀.用腐蚀电化学法研究了321不锈钢在有溶解氧的硝酸铀酰溶液中的腐蚀电化学特性,测量了电极的腐蚀电位、腐蚀电流密度.经AES分析表明,电化学腐蚀后的样品在腐蚀膜中有一定量的铀,深度剖析含铀腐蚀膜的厚度为10～15nm.

Weighing and electrochemical methods have been used to investigate the high-temperature uniform corrosion and electrochemical corrosion behavior of 1Crl8Ni9Ti (321) stainless steel in uranium nitrate solution at different concentrations and pH values. The uniform corrosion results showed that the corrosion rate of 321 stainless steel was less than 0.04 g/m2.h, and the visible change of surface smoothness was not observed through 960 h. It was perfect corrosion-resisting in obtained conditions. The electrochemical corrosion behavior study has been performed to investigate 321 stainless steel in uranium nitrate solutions of the dissolved and saturated oxygen. The corrosion potential and corrosion current density were obtained. Auger photoelectron spectroscopy for measurement of uranium in specimen was used to indicate that there is uranium in corrosion product. The corrosion film was measured by Ar ion gun sputter, and the thickness is 10-15 nm.