Effect of microstructure variation on the corrosion behavior of high-strength low-alloy steel in 3.5wt% NaCl solution

• Published in: International journal of minerals, metallurgy and materials Vol. 22; no. 6; pp. 604 - 612
• Main Authors: Guo, Yu-bing, Li, Chong, Liu, Yong-chang, Yu, Li-ming, Ma, Zong-qing, Liu, Chen-xi, Li, Hui-jun
• Format: Journal Article
• Language: English
• Published: Beijing University of Science and Technology Beijing 01.06.2015; Springer Nature B.V; State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
• Subjects: Ceramics; Characterization and Evaluation of Materials; Charge transfer; Chemistry and Materials Science; Composites; Corrosion; Corrosion and Coatings; Corrosion effects; Corrosion products; Corrosion rate; Corrosion resistance; Corrosion resistant steels; Electrochemical impedance spectroscopy; Electrochemistry; Glass; Heat treating; High strength low alloy steels; Martensite; Materials Science; Metallic Materials; Microstructure; NaCl溶液; Natural Materials; Polygons; Sodium chloride; Steel; Surfaces and Interfaces; Thin Films; Tribology; Weight loss measurement; 低合金高强度钢; 动电位极化曲线; 微观结构变化; 耐腐蚀性能; 腐蚀行为; 针状铁素体; 铁素体钢; corrosion; microstructure; high-strength low-alloy steel; sodium chloride solutions
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-015-1113-z

The effect of microstructure variation on the corrosion behavior of high-strength low-alloy（HSLA） steel was investigated. The protective property of the corrosion product layer was also explored. Experimental results reveal that the type of microstructure has significant effect on the corrosion resistance of HSLA steel. The measurement results of weight loss, potentiodynamic polarization curves, and electrochemical impedance spectroscopy indicate that the steel with acicular ferrite microstructure exhibits the lowest corrosion rate. Martensite exhibits a reduced corrosion resistance compared with polygonal ferrite. It is found that the surface of the acicular ferrite specimen uniformly covered by corrosion products is seemingly denser and more compact than those of the other two microstructures, and can provide some amount of protection to the steel; thus, the charge transfer resistance and modulus values of the acicular ferrite specimen are the largest. However, corrosion products on martensite and polygonal ferrite are generally loose, porous, and defective, and can provide minor protectiveness; thus, the charge transfer resistance values for polygonal ferrite and martensite are lower.