研究憎水膜层表面憎水角、憎水角滞后、红外吸收光谱、交流阻抗响应、表面微观结构等变化,探讨不同环境条件和基材对憎水膜层失效行为的影响.结果表明:室外大气暴露环境中憎水性能衰减速率较室内环境的快,室内环境暴露115d的膜层憎水角仍在100°以上,而同样在室外环境中憎水膜层的憎水角则下降到50°左右.红外分析表明,室外憎水膜层中Si-O-Si长链结构和Si-H键遭破坏;在模拟积水环境中钢与铝合金上的膜层憎水性能及水滴在膜层表面的流动性能差异较大,但两种材料上的憎水膜层分子结构未发生明显改变;AFM测试结果表明,膜层本身粗糙度的降低是导致憎水性能下降的原因之一.
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