文献类型：期刊文献

英文题名：Improving anticorrosion performance of hydroxyapatite via controlling exposed crystal surface and applications

作者：Guo, Xiao-Jiao[1];Yuan, Xiao-Yu[1];Zhao, Si-Rui[1];Liu, Jin-Ku[1,2];Xue, Xi-Zi[1,2];Xue, Ya-Nan[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[2]Key Lab Sichuan Prov, Mat Corros & Protect, Chengdu 643000, Sichuan, Peoples R China

年份：2020

卷号：845

外文期刊名：JOURNAL OF ALLOYS AND COMPOUNDS

收录：;EI(收录号：20202908953169);WOS:【SCI-EXPANDED(收录号:WOS:000566715900008)】；

基金：This work was supported by the National Natural Science Foundation of China (Grant 21878090) and the Opening Project of Material Corrosion and Protection Key Laboratory of Sichuan province (Grant 2020CL04).

语种：英文

外文关键词：Anion exchange; Crystal facet; Hydroxyapatite; Anticorrosion

摘要：The relationship between crystal facet and anticorrosion performance is studied by controlling the microstructure of hydroxyapatite (HAP). HAP in shape of rectangular plate exposing (002) facets promotes it exerting anticorrosion activity. The displacement reaction occurs between OH- groups on (002) facet and corrosive Cl-, which reduces the corrosion rate. At the same time, anion exchange forms a stable chlorapatite to further enhance shielding effect of coatings. Moreover, self-supporting mechanism is proposed to explain the conversion between tetracalcium phosphate (TTCP) and HAP is benefited to making up for HAP consumed in the anticorrosion process. The rectangular plate-like HAP also prolongs the diffusion path of corrosive substances. Therefore, HAP with bare (002) facet raises the impedance by 110.3% compared with common HAP with exposed (300) facet. This research provides a direction for reducing the consumption and effective use of materials in the coatings industry. (C) 2020 Elsevier B.V. All rights reserved.