Xingyue Liu, Wenchao Zheng, Xiaolong Li, Guo-jun Tang, Lin Hu, Sanlin Fei, Dunshi Zhou, Lu Gan
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Hot Corrosion Behavior and Protection of 430 Ferritic Stainless Steel in Nitrate Salts at 650 ℃
Hot corrosion leads to a significant challenge for next-generation concentrating solar power systems, particularly in thermal energy storage and heat transfer applications at elevated temperatures. This study investigated the corrosion behavior of 430 ferritic stainless steel in nitrate salts at 650 °C and proposed a targeted protective strategy. The primary novelty lies in the identification of a critical interfacial oxygen recombination mechanism via in situ 18O isotopic tracing. This mechanism drives oxide phase transformations, reducing activation energy and generating high-density defects that accelerate oxidant transport. Consequently, the uncoated steel suffered catastrophic failure, characterized by a 12-fold increase in oxide scale thickness and severe Cr-depletion. To mitigate this, a multilayer Si-P-Co-W (SPCW) coating was developed. Mechanistically, the coating blocks the interfacial oxygen recombination and suppresses Cr3+ outward diffusion through a dense tungsten-rich barrier. The coating significantly enhances corrosion resistance, reducing the internal oxidation depth from 13 ± 2.18 μm to 4.5 ± 0.9 μm, demonstrating its potential for high-temperature thermal energy storage applications.
期刊介绍：
Oxidation of Metals is the premier source for the rapid dissemination of current research on all aspects of the science of gas-solid reactions at temperatures greater than about 400˚C, with primary focus on the high-temperature corrosion of bulk and coated systems. This authoritative bi-monthly publishes original scientific papers on kinetics, mechanisms, studies of scales from structural and morphological viewpoints, transport properties in scales, phase-boundary reactions, and much more. Articles may discuss both theoretical and experimental work related to gas-solid reactions at the surface or near-surface of a material exposed to elevated temperatures, including reactions with oxygen, nitrogen, sulfur, carbon and halogens. In addition, Oxidation of Metals publishes the results of frontier research concerned with deposit-induced attack. Review papers and short technical notes are encouraged.
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