{"title":"NaCl-Induced High-Temperature Corrosion of Alloy 625 Fabricated by Laser Metal Deposition-Powder","authors":"Agathe Curnis, Ioana Popa, Aurélien Prillieux, Jean-Michel Brossard, Sébastien Chevalier","doi":"10.1007/s11085-024-10279-2","DOIUrl":null,"url":null,"abstract":"<div><p>The present study describes the corrosion behavior of alloy 625 fabricated by laser metal deposition-<i>powder</i> in the presence of a solid NaCl deposit in laboratory air at 650 and 800 °C. The results showed that at both temperatures, the presence of the deposit had a catastrophic effect on the corrosion resistance of the alloy. The active corrosion mechanism resulted in a very thick and non-protective oxide scale and in a highly damaged metal zone beneath the oxide scale. Although the mechanism involved was the active corrosion mechanism at both 650 and 800 °C, differences were observed between these two temperatures. At 800 °C, the corrosion products were thicker, and the substrate was significantly more damaged, especially due to the formation of an interconnected network of voids. At 650 °C, the thick and continuous Cr<sub>2</sub>O<sub>3</sub> layer, predominantly observed at 800 °C, was not present. The use of thermodynamic data helped to suggest possible explanations for the observed differences. Overall, the increase of temperature accelerated the degradation of the alloy and it was enhanced by a radical change of the main reactions of the active corrosion mechanism between 650 and 800 °C.</p></div>","PeriodicalId":724,"journal":{"name":"Oxidation of Metals","volume":"101 5","pages":"1143 - 1154"},"PeriodicalIF":2.1000,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Oxidation of Metals","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s11085-024-10279-2","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}
引用次数: 0
Abstract
The present study describes the corrosion behavior of alloy 625 fabricated by laser metal deposition-powder in the presence of a solid NaCl deposit in laboratory air at 650 and 800 °C. The results showed that at both temperatures, the presence of the deposit had a catastrophic effect on the corrosion resistance of the alloy. The active corrosion mechanism resulted in a very thick and non-protective oxide scale and in a highly damaged metal zone beneath the oxide scale. Although the mechanism involved was the active corrosion mechanism at both 650 and 800 °C, differences were observed between these two temperatures. At 800 °C, the corrosion products were thicker, and the substrate was significantly more damaged, especially due to the formation of an interconnected network of voids. At 650 °C, the thick and continuous Cr2O3 layer, predominantly observed at 800 °C, was not present. The use of thermodynamic data helped to suggest possible explanations for the observed differences. Overall, the increase of temperature accelerated the degradation of the alloy and it was enhanced by a radical change of the main reactions of the active corrosion mechanism between 650 and 800 °C.
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.