期刊
ACS APPLIED NANO MATERIALS
卷 2, 期 1, 页码 180-190出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.8b01821
关键词
graphene; zinc-rich coatings; corrosion protection mechanisms; PANI
资金
- National Natural Science Foundation of China [51775540]
- Zhejiang Province Key Technology Project [2015C01006]
- Youth Innovation Promotion Association, CAS [2017338]
- Science and Technology Major Project of Ningbo [2015S1001]
In order to hold the excellent corrosion resistance of zinc-rich epoxy coatings with reduced zinc content, five types of graphene modified zinc-rich epoxy coatings (G-ZRCs) were prepared. The effect of zinc content on the corrosion protection behaviors of G-ZRCs was investigated using electrochemical impedance spectroscopy (EIS). Open circuit potential (OCP) was also utilized to deepen the understanding of the anticorrosion mechanism of the as-prepared composite coatings. The results confirmed that addition of 0.3 wt % graphene could make the coating with 40 wt % (G-40ZRC) and 55 wt % zinc (G-SSZRC) provide cathodic protection for a short period of time. The EIS and OCP results showed a dominant physical barrier protection mechanism for the coatings without zinc (G-ZRC), while there was a mixed mechanism for G-40ZRC and G-55ZRC and a dominant cathodic protection mechanism for the coatings with 70 and 85 wt % zinc (G-70ZRC and G-85ZRC). Furthermore, the graphene modified zinc-rich coatings and corresponding corrosion products immersed in a 3.5% NaCl solution for 100 days were also characterized, which could further reveal anticorrosion mechanisms of the graphene modified zinc-rich coatings and the passivation effect of polyaniline (PANI).
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