Corrosion mechanism of potassium silicate coating on Ti-6Al-4V alloys under solid NaCl deposit at 700 °C

doi:10.1016/j.ceramint.2024.04.194

IMR OpenIR

	Corrosion mechanism of potassium silicate coating on Ti-6Al-4V alloys under solid NaCl deposit at 700 °C
	Chen, Zheng 1,2; Du, Yao 1,2; Lu, Yiliang 2,3,5; Wang, Cheng 2; Xin, Li 2,4; Zhu, Shenglong 2,4; Wang, Fuhui 4
通讯作者	Zhu, Shenglong(slzhu@imr.ac.cn)
	2024-07-01
发表期刊	CERAMICS INTERNATIONAL
ISSN	0272-8842
卷号	50 期号:13 页码:24594-24607
摘要	A potassium silicate coating cured by calcium hydrogen phosphate was prepared on Ti-6Al-4V, and its protection behavior against NaCl-induced corrosion was investigated at 700 degrees C for 500 h by the means of thermogravimetry, SEM, EMPA, XRD and TEM. The bare Ti-6Al-4V alloy suffered severe corrosion as the thickness of corrosion production layer exceeded 2 mm after 500 h. The major corrosion production was TiO2, and sodium titanates was observed within 100 h while disappeared after long-term tests. Accordingly, a novel model for NaCl-induced corrosion of Ti alloys at high temperatures was proposed. That is, the porosity of the corrosion product is strongly correlated with the reaction between water vapor in air and sodium titanates at high temperatures. The coating exhibited excellent protection as the corroded substrate layer, which is Ti5Si3 resulted from coating-substrate reaction, is similar to 6.6 mu m only, and no oxide scale was formed. Dissolution of Na in the coating was identified and is believed to be associated with the protective mechanism of the potassium silicate coating, i.e. this dissolution avoids chlorination-oxidation of Ti alloy.
关键词	Ti6Al4V alloys Potassium silicate coating NaCl High temperature corrosion
DOI	10.1016/j.ceramint.2024.04.194
收录类别	SCI
语种	英语
WOS研究方向	Materials Science
WOS类目	Materials Science, Ceramics
WOS记录号	WOS:001243029100001
出版者	ELSEVIER SCI LTD
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/186942
专题	中国科学院金属研究所
通讯作者	Zhu, Shenglong
作者单位	1.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China 3.Jiangsu JITRI Rd Engn Technol & Equipment Res Inst, Xuzhou 220005, Peoples R China 4.Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 5.State Grid Smart Grid Res Inst Co Ltd, State Key Lab Adv Power Transmiss Technol, Beijing 102209, Peoples R China
推荐引用方式 GB/T 7714	Chen, Zheng,Du, Yao,Lu, Yiliang,et al. Corrosion mechanism of potassium silicate coating on Ti-6Al-4V alloys under solid NaCl deposit at 700 °C[J]. CERAMICS INTERNATIONAL,2024,50(13):24594-24607.
APA	Chen, Zheng.,Du, Yao.,Lu, Yiliang.,Wang, Cheng.,Xin, Li.,...&Wang, Fuhui.(2024).Corrosion mechanism of potassium silicate coating on Ti-6Al-4V alloys under solid NaCl deposit at 700 °C.CERAMICS INTERNATIONAL,50(13),24594-24607.
MLA	Chen, Zheng,et al."Corrosion mechanism of potassium silicate coating on Ti-6Al-4V alloys under solid NaCl deposit at 700 °C".CERAMICS INTERNATIONAL 50.13(2024):24594-24607.