Enhanced corrosion resistance properties of Fe-Al-Cr laser cladding coatings on 1045 carbon steel substrates

Xixi Luo; Jing Cao; Fangli Yu; Yalong Zhang; Jianjiang Tang; Xin Li; Hui Xie

doi:10.1016/j.heliyon.2023.e13855

Enhanced corrosion resistance properties of Fe-Al-Cr laser cladding coatings on 1045 carbon steel substrates

Heliyon. 2023 Feb 20;9(3):e13855. doi: 10.1016/j.heliyon.2023.e13855. eCollection 2023 Mar.

Authors

Xixi Luo^{1

2}, Jing Cao¹, Fangli Yu¹, Yalong Zhang¹, Jianjiang Tang¹, Xin Li¹, Hui Xie¹

Affiliations

¹ School of Materials Engineering, Xi'an Aeronautical University, Xi'an 710077, China.
² State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China.

Abstract

Fe-Al-Cr coatings with different content of Cr additive were prepared on 1045 carbon steel substrates by a laser cladding process. The incorporation of Cr atoms can effectively enhance the corrosion resistance of the coatings. In particular, the Fe-28Al-5Cr laser cladding coating exhibits the best film quality without phase segregation. In addition, the interfacial adhesion between the Fe-28Al-5Cr coating and the 1045 carbon steel substrate is improved. As a result, the Fe-28Al-5Cr laser cladding coating exhibits the best corrosion resistance in a 3.5 wt% NaCl solution under both immersion and electrochemical conditions. However, excessive Cr additive lead to the formation of Al₈Cr₅ in the grain boundaries, resulting in inferior corrosion resistance. Therefore, the new findings demonstrated in this work may inspire the design of high-quality coatings with excellent corrosion resistance.

Keywords: Coating; Corrosion resistance; Cr additive; Fe3Al; Laser cladding.