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| Effect of aging treatment process on corrosion resistance of high nitrogen stainless steel for marine engineering |
| LIU Jimeng1,2, LI Hao1,2, WANG Shuhuan1,2, ZHAO Dingguo1,2, NI Guolong1,2 |
1. School of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China;
2. Tangshan Key Laboratory of Special Metallurgy and Materials Preparation, Tangshan 063210, Hebei, China |
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Abstract Stainless steel for marine engineering needs to be soaked in seawater for a long time, and seawater itself is good electrolyte with high salt content and low resistivity, which is big test for the corrosion resistance of stainless steel. 18Cr15.5Mn1.4MoN high nitrogen austenitic stainless steel was taken as the research object, and the effect of aging second phase precipitation behavior on the corrosion resistance of test steel was analyzed through aging treatment after solid solution. The salt spray corrosion test was carried out on test steel, the weight loss rate and corrosion rate were calculated, and the potentiodynamic polarization curve of test steel was determined. The results show that the corrosion resistance of test steel after different aging treatments is quite different, and the corrosion resistance of test steel aged at 600 ℃ for 0.5 h is the best, the weight loss rate and corrosion rate are 1.157% and 4.608×10-5 g/(cm2·h), respectively. Test steel aged at 800 ℃ for 2 h has the worst corrosion resistance, and the weight loss rate and corrosion rate are 3.737% and 1.502×10-4 g/(cm2·h), respectively. The corrosion resistance of 316L stainless steel is between the two, and the weight loss rate and corrosion rate are 1.423% and 6.751×10-5 g/(cm2·h), respectively. When the second phase Cr2N precipitates in a large amount, it will seriously reduce the corrosion resistance of sample steel performance. By observing the second phase precipitation and dissolution behavior of high nitrogen stainless steel used in marine engineering, the relationship between the second phase precipitation behavior and the corrosion resistance of high nitrogen stainless steel is elucidated, providing theoretical basis for subsequent analysis of effect for secondary phase precipitation on properties of metal materials at high temperatures.
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Received: 25 June 2023
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2023, Vol. 33 
