文献类型：期刊文献

英文题名：Corrosion resistance of inorganic zinc-rich coating reinforced by Ni-coated coal fly ash

作者：Cheng, Lihong[1,2];Luo, Yang[2];Ma, Shuhua[2];Guo, Weihong[1];Wang, Xiaohui[2]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Preparat & Applicat Ultrafine Mat, Polymer Proc Lab,Minist Educ, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Key Lab Green Proc & Engn, Beijing, Peoples R China

年份：2019

卷号：786

起止页码：791

外文期刊名：JOURNAL OF ALLOYS AND COMPOUNDS

收录：;EI(收录号：20190606484052);WOS:【SCI-EXPANDED(收录号:WOS:000461778600095)】；

语种：英文

外文关键词：Zinc-rich coating; Coal fly ash; Anticorrosion; Ni

摘要：To recycle the solid waste coal fly ash (CFA), a new approach of adding Ni-coated coal fly ash (Ni-CFA) to waterborne inorganic zinc-rich coatings (ZRCs) was proposed. The effect of Ni-CFA on the corrosion resistance of ZRCs was investigated systematically using open-circuit potential (OCP) measurements, the DC polarization technique and electrochemical impedance spectroscopy (EIS). The results showed that the addition of 6.6 wt% Ni-CFA noticeably improved the cathodic protection of the coating due to the electrical conductivity of the Ni layer and decreased the corrosion current when providing barrier protection. Meanwhile, the active SiO2 on the surface of CFA was found to increase the degree of cross-linking of the potassium silicate, resulting in better mechanical properties of the coating, as measured using a bending test. Three corrosion stages were observed, with equivalent circuits expressed by R(QR), R(Q(R(QR)))(QR) and R(Q(RW)). (C) 2019 Elsevier B.V. All rights reserved.