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Corrosion behavior of laser-cladding nickel-based coating in high-temperature molten chloride salts.

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Title: Corrosion behavior of laser-cladding nickel-based coating in high-temperature molten chloride salts.
Authors: Xu, Xiaomao1 (AUTHOR), Wang, Liuxin1 (AUTHOR), Liu, Sijie1,2 (AUTHOR), Zhang, Jintao1,3 (AUTHOR), Mao, Xueli4 (AUTHOR), Fei, Xiaodan5 (AUTHOR), Wu, Yang5 (AUTHOR), Pu, Guo5 (AUTHOR), Ge, Fangfang2 (AUTHOR), Chai, Linjiang6 (AUTHOR), Li, Bingsheng1 (AUTHOR) libingshengmvp@163.com
Source: Solar Energy Materials & Solar Cells. May2026, Vol. 298, pN.PAG-N.PAG. 1p.
Subject Terms: *Nickel alloys, Steel corrosion, Durability, Fused salts, High temperatures, Iron-nickel alloys, Laser deposition
Abstract: Ni-based coating (15Fe16Cr63Ni) was fabricated via laser cladding on one surface of a 316L stainless steel substrate, while the opposing surface was subjected to laser remelting. This configuration created a macro-galvanic couple, which is representative of some practical scenarios where dissimilar materials are connected. The corrosion behavior of this coupled system in NaCl-MgCl 2 -KCl salts at 700 °C was investigated up to 1200 h. The results highlight a galvanic effect, while the Ni-coating was cathodically protected. Despite this coupling, a continuous Fe-Ni-rich layer formed in-situ on the coating surface, acting as a barrier. A critical finding is that even under the protective influence of galvanic coupling, the corrosion products and mechanisms for both sides evolved similarly, forming Mg 2 SiO 4 beneath the Fe-Ni layer. A dedicated short-term (100 h) test with isolated, symmetrically treated specimens confirmed that the intrinsic corrosion rate of the Ni-coating is lower than that of the laser-remelted surface. Thus, the findings stress the paramount importance of mitigating galvanic coupling in design. The behavior observed suggests that the Ni-coating has considerable potential; however, verifying its long-term durability through testing under fully electrochemically isolated conditions remains an essential prerequisite for its reliable application. • Laser-cladding Ni coating in molten chloride salt were corroded at 700 °C for 400–1200 h. • The corrosion rate of the Ni-coating is lower than that of the laser-remelted surface. • The Fe-Ni phase provides a significant barrier to corrosion. [ABSTRACT FROM AUTHOR]
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Abstract:Ni-based coating (15Fe16Cr63Ni) was fabricated via laser cladding on one surface of a 316L stainless steel substrate, while the opposing surface was subjected to laser remelting. This configuration created a macro-galvanic couple, which is representative of some practical scenarios where dissimilar materials are connected. The corrosion behavior of this coupled system in NaCl-MgCl 2 -KCl salts at 700 °C was investigated up to 1200 h. The results highlight a galvanic effect, while the Ni-coating was cathodically protected. Despite this coupling, a continuous Fe-Ni-rich layer formed in-situ on the coating surface, acting as a barrier. A critical finding is that even under the protective influence of galvanic coupling, the corrosion products and mechanisms for both sides evolved similarly, forming Mg 2 SiO 4 beneath the Fe-Ni layer. A dedicated short-term (100 h) test with isolated, symmetrically treated specimens confirmed that the intrinsic corrosion rate of the Ni-coating is lower than that of the laser-remelted surface. Thus, the findings stress the paramount importance of mitigating galvanic coupling in design. The behavior observed suggests that the Ni-coating has considerable potential; however, verifying its long-term durability through testing under fully electrochemically isolated conditions remains an essential prerequisite for its reliable application. • Laser-cladding Ni coating in molten chloride salt were corroded at 700 °C for 400–1200 h. • The corrosion rate of the Ni-coating is lower than that of the laser-remelted surface. • The Fe-Ni phase provides a significant barrier to corrosion. [ABSTRACT FROM AUTHOR]
ISSN:09270248
DOI:10.1016/j.solmat.2026.114160