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Functionalization of stainless steel 316L with corrosion resistant polymer films

机译：不锈钢316L与耐腐蚀聚合物薄膜的官能化

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Stainless steel 316L (SS316L) is a commonly employed alloy with high corrosion resistance due to its chromium content. However, in marine environments it is susceptible to pitting corrosion because of the presence of chloride ions, which leads to a breakdown of the passive oxide layer. Here, we present a surface modification which impedes corrosion by employing surface-initiated atom transfer radical polymerization utilizing three common monomers, styrene, methyl acrylate, and methyl methacrylate via an improved surface-initiated polymerization route. The organic films were characterized by infrared spectroscopy, atomic force microscopy and contact angle goniometry. The electrochemical activity of the surface was monitored by cyclic voltammetry and electrochemical impedance spectroscopy. Modifications resulted in up to 99.9% fractional surface coverage and protection efficiencies of up to 99.3% with no decrease in coating coverage in saline conditions over a 72 hour period. Furthermore, SEM analysis of the polymer modified substrates indicated no pitting after simulated corrosion. These electrochemical and imaging results indicate that these new films could be effective in protecting against corrosion.
机译：不锈钢316L（SS316L）是常用合金，其铬含量具有高耐腐蚀性。然而，在海洋环境中，由于存在氯离子的存在，它易于蚀刻腐蚀，这导致被动氧化物层的击穿。这里，我们提出了一种表面改性，通过使用三种普通单体，苯乙烯，丙烯酸甲酯和甲基丙烯酸甲酯通过改进的表面引发的聚合途径使用表面引发的原子转移自由基聚合来阻抗腐蚀。通过红外光谱，原子力显微镜和接触角焦点表征有机薄膜。通过循环伏安法和电化学阻抗光谱监测表面的电化学活性。修改导致高达99.9％的分数表面覆盖率和高达99.3％的保护效率，盐水条件下没有减少72小时内的涂层覆盖率。此外，聚合物改性底物的SEM分析表明模拟腐蚀后没有点蚀。这些电化学和成像结果表明，这些新薄膜可以有效地保护腐蚀。

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