High-Loading Smart Carrier Containing 2-Mercaptobenzimidazole-Zn2+-Polydopamine with pH-Responsive Function to Fabricate High-Performance Waterborne Epoxy Anticorrosion Coatings,ACS Applied Materials & Interfaces

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High-Loading Smart Carrier Containing 2-Mercaptobenzimidazole-Zn2+-Polydopamine with pH-Responsive Function to Fabricate High-Performance Waterborne Epoxy Anticorrosion Coatings
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2024-04-05 , DOI: 10.1021/acsami.4c02722
Qiang Liu _{1,

2} , Hao Li _{1,

2} , Ling Kong ₃ , Yiming Du _{1,

2} , Yunsheng Da _{1,

2} , Zhouping Sun _{1,

2} , Yong Dong _{1,

2} , Wei Zhang ₂ , Yanyan Liu ₂ , Xingyou Tian ₂ , Hua Wang ₂

Affiliation

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 R_p 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.

中文翻译：

含具有pH响应功能的2-巯基苯并咪唑-Zn2+-聚多巴胺的高负载量智能载体制备高性能水性环氧防腐涂料

缓蚀剂添加剂被认为是减缓金属腐蚀的有效方法之一，但缓蚀剂在长期的腐蚀环境中会分解而失去作用。本工作采用一锅法设计并合成了具有优异pH响应的智能缓蚀剂载体2-巯基苯并咪唑-Zn ²⁺ -聚多巴胺@石墨(MZPG)。该缓蚀剂载体不仅具有极高的2-巯基苯并咪唑（MBI）负载量（38.0%），而且保持极低的MBI活性，尽可能抑制MZPG在环境中的分解。采用喷涂法制备的MZPG/环氧树脂(MZPG/EP)涂层表现出优异的力学性能。电化学和盐雾试验表明，MZPG/EP涂层（1.20 × 10 ¹⁰ Ω·cm ² ）具有优异的耐腐蚀性能， R _p值比EP涂层（1.25 × 10 ⁷ Ω·cm 2 ）高出3个数量级。厘米² ）。值得注意的是，由于缓蚀剂的 pH 响应释放，MZPG/EP 涂层在酸性条件下保持了良好的耐腐蚀性。这对于未来高腐蚀环境用涂料的发展具有重要意义。

更新日期：2024-04-05

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