腐蚀
材料科学
环氧树脂
涂层
电化学
盐(化学)
盐雾试验
化学工程
缓蚀剂
冶金
复合材料
有机化学
化学
电极
工程类
物理化学
作者
Qiang Liu,Hao Li,Lingzhao Kong,Yunfei Du,Yunsheng Da,Zhouping Sun,Dong Yang,Wenrui Zhang,Yanyan Liu,Xingyou Tian,Hua Wang
标识
DOI:10.1021/acsami.4c02722
摘要
Corrosion inhibitor additives are considered to be one of the effective methods to slow down the corrosion of metals, but the corrosion inhibitors will decompose and lose their effect in a long-term corrosive environment. In this work, a smart corrosion inhibitor carrier 2-mercaptobenzimidazole-Zn2+-polydopamine@graphite (MZPG) with excellent pH response was designed and synthesized using a one-pot method. This corrosion inhibitor carrier not only has a very high 2-mercaptobenzimidazole (MBI) loading capacity (38.0%) but also maintains a very low MBI activity to inhibit the decomposition of MZPG in the environment as much as possible. The MZPG/epoxy (MZPG/EP) coatings prepared by the spraying method showed excellent mechanical properties. Electrochemical and salt spray tests showed that the MZPG/EP coatings (1.20 × 1010 Ω·cm2) have excellent corrosion resistance with Rp values up to 3 orders of magnitude higher than that of the EP coating (1.25 × 107 Ω·cm2). Notably, the MZPG/EP coatings maintained good corrosion resistance under acidic conditions due to the pH-responsive release of corrosion inhibitors. This is of great significance for the future development of coatings for highly corrosive environments.
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