钢结构防腐涂层面漆可剥离现象的原因分析及处理措施

目的分析钢结构防腐涂层面漆出现可剥离现象的原因。方法利用质谱仪、环境扫描电镜、ICS 1100型离子色谱仪对涂料和漆膜进行测试分析。结果聚氨酯涂料和漆膜样品含有高沸点溶剂三甲苯和四甲苯,通过微观形貌分析发现漆膜固化不充分,在漆膜样品的萃取溶液中检测出了铵基盐类物质。结论聚氨酯涂料中的高沸点溶剂、低温环境下的小分子胺析出和湿热海洋环境是导致涂层面漆出现大面积可剥离现象的主要原因。

Cause Analysis and Countermeasures for the Peeling Phenomenon of the Anticorrosive Finishes for Steel Structure

Objective To analyze the cause for the peeling phenomenon of the anticorrosive finishes for steel structure. Methods The compositions of paint and varnish were tested and analyzed by mass spectrometer, environmental scanning elecron microscope and ICS1100. Results High boiling point solvents were found in polyurethane paint and varnish samples. Inadequate curing of the varnish was found by microscopic morphology analysis, and ammonium salt was detected in the extraction liquid of the varnish sample. Conclusion The high boiling point solvents, the separation of small molecules in low temperature environment and warm-damp marine environment were the main causes for the large-area peeling phenomenon of finishes.