Effect of sol-gel layers obtained from GLYMO/MTES mixtures on the delamination of a cataphoretic paint on AA1050
Effect of sol-gel layers obtained from GLYMO/MTES mixtures on the delamination of a cataphoretic paint on AA1050
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DOI：
10.1007/s11998-016-9860-y
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发表时间：
2017-03-01
影响因子：
2.3
通讯作者：
Fedel, Michele
中科院分区：
文献类型：
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作者：
Fedel, Michele
在这项研究中，不同的溶胶-凝胶层的性能从不同的混合物的硅醇盐前体（γ-缩水甘油氧基丙基三甲氧基硅烷，GLYMO，和甲基三乙氧基硅烷，MTES）应用于AA 1050铝合金作为预处理之前，沉积电泳漆（聚醚-聚胺聚合物共混物）进行了研究。采用衰减全反射红外光谱（ATR FTIR）对溶胶-凝胶涂层的结构进行了表征，采用极化曲线对涂层的耐蚀性能进行了评价。加速实验室测试，如在中性和醋酸盐雾室和丝状腐蚀试验中的暴露，被用来研究阳电泳涂料涂层样品的腐蚀防护性能。不同涂层的失效机理进行了研究。实验表明，溶胶-凝胶涂层中GLYMO的存在似乎不适合作为涂料与铝基材之间的偶联剂。在积极的注意，这项工作表明，丝状腐蚀测试似乎是最合适的测试，以评估效率的溶胶-凝胶层作为预处理，以提高铝基板上的涂料提供的腐蚀保护。
In this study, the performance of different sol-gel layers produced from different mixtures of silicon alkoxides precursors (gamma-glycidoxypropyltrimethoxysilane, GLYMO, and methyltriethoxysilane, MTES) applied on AA1050 aluminum alloy as a pretreatment prior to depositing an electrophoretic paint (polyether-polyamine polymeric blend) is investigated. The structure of the sol-gel coatings was characterized by means of ATR FTIR, while the corrosion protection properties were assessed by polarization curves. Accelerated laboratory tests, such as exposure in both neutral and acetic salt spray chambers and filiform corrosion tests, were employed to investigate the corrosion protection properties of the cataphoretic paint-coated samples. The failure mechanisms of the different coatings were investigated. The experiments revealed that the presence of GLYMO in the sol-gel coating seems not to be suitable for acting as a coupling agent between the paint and the aluminum substrate. On a positive note, this work shows that the filiform corrosion test seems to be the most appropriate test to evaluate the efficiency of sol-gel layers employed as pretreatment to enhance the corrosion protection provided by a paint on an aluminum substrate.