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首页> 外文期刊>Progress in Organic Coatings: An International Review Journal >The effect of surface modification on the cathodic disbondment rate of epoxy and alkyd coatings
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The effect of surface modification on the cathodic disbondment rate of epoxy and alkyd coatings

机译：表面改性对环氧和醇酸涂料阴极离解速率的影响

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Surface modification of carbon steel substrates using appropriate functionalised silanes was carried out to investigate their effect on the dry and wet adhesion strength, and the cathodic disbondment rate, of coating binders based on epoxy and alkyd chemistries. Results show that pre-treatment of the steel substrate with 3-glycidoxypropyltrimethoxy silane (3-GPS) enhanced the dry and wet adhesion of an epoxy-based coating. Similarly, pre-treatment with 3-aminopropyltriethoxy silane (3-APS) enhanced the dry and wet adhesion of alkyd-based systems. However, although pre-treatment with 3-GPS reduced the cathodic disbondment rate for epoxy by a factor of 3, no effect on the disbondment rate for alkyd-based binders on substrates pre-treated with 3-APS was found. This strongly suggests that cathodic disbondment of epoxy proceeds by disruption of interfacial bonds (i.e. at the binder/substrate interface) but that disbondment of alkyds proceeds by direct degradation of the binder and that the interface plays little part in the process. (c) 2005 Elsevier B.V. All rights reserved.
机译：进行了使用适当的官能化硅烷对碳钢基材进行表面改性的研究，以研究其对基于环氧和醇酸化学的涂料粘合剂的干，湿粘合强度以及阴极剥离速率的影响。结果表明，用3-环氧丙氧基丙基三甲氧基硅烷（3-GPS）对钢基材进行预处理可增强环氧基涂料的干湿粘合力。同样，使用3-氨丙基三乙氧基硅烷（3-APS）进行预处理可以提高醇酸基体系的干湿粘合性。然而，尽管用3-GPS预处理将环氧树脂的阴极解离速率降低了3倍，但未发现对用3-APS预处理的基材上的醇酸基粘合剂的解离速率有影响。这有力地暗示了通过界面键的破坏（即在粘合剂/底物界面处）进行的环氧树脂的阴极解离，但是通过粘合剂的直接降解来进行醇酸树脂的解离，并且该界面在该过程中几乎没有作用。 （c）2005 Elsevier B.V.保留所有权利。

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