桥梁钢结构防腐蚀涂层失效分析
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摘要
针对桥梁钢结构件防腐蚀涂层在外界复杂环境下易发生涂层老化造成使用寿命下降的问题,建立不同防腐蚀涂层体系的失效分析模型。对比分析了人工曝光环境和自然曝光环境下不同涂层体系的吸水率、失光率、老化级别等指标,获得防腐蚀涂层耐久性特征。研究结果表明:人工曝光环境下和自然曝光环境下,不同防腐涂层的失光率和吸水率由大到小依次为:黑聚氨酯体系>氯化橡胶面>丙烯酸聚氨酯体系;通过SEM表面观察和涂层老化评价综合获得涂层的耐蚀性由大到小依次为:丙烯酸聚氨酯体系>氯化橡胶面>黑聚氨酯体系。因此,实际应用中可根据桥梁结构所处的外界环境选择合适的防腐蚀涂层体系。
corrosion coating of bridge steel structure is prone to aging and life decline in complex environment. The failure analysis models of different corrosion coating systems were established,and the durability characteristics of corrosion resistant coatings were obtained by comparing the water absorption,loss of light and aging grade of different coating systems under artificial exposure and natural exposure.The results show that the loss of light and water absorption of different anticorrosive coatings under artificial exposure and natural exposure are black polyurethane system > chlorinated rubber surface >acrylic polyurethane system. The corrosion resistance of the coating from large to small is propylene. Acid polyurethane system > chlorinated rubber surface > black polyurethane system. Therefore, the appropriate anticorrosive coating system can be selected according to the different external environment of the bridge structure in practical application.
corrosion coating of bridge steel structure is prone to aging and life decline in complex environment. The failure analysis models of different corrosion coating systems were established,and the durability characteristics of corrosion resistant coatings were obtained by comparing the water absorption,loss of light and aging grade of different coating systems under artificial exposure and natural exposure.The results show that the loss of light and water absorption of different anticorrosive coatings under artificial exposure and natural exposure are black polyurethane system > chlorinated rubber surface >acrylic polyurethane system. The corrosion resistance of the coating from large to small is propylene. Acid polyurethane system > chlorinated rubber surface > black polyurethane system. Therefore, the appropriate anticorrosive coating system can be selected according to the different external environment of the bridge structure in practical application.
引文
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[2]崔静娜.桥梁钢结构件防腐蚀涂层腐蚀全寿命设计研究[D].西安:长安大学,2016(06):115.
[3]叶觉明.锌加涂料在桥梁钢结构腐蚀防护中的应用[J].现代涂料与涂装,2006(12):37-39.
[4]张辉.对现代桥梁钢结构防腐涂层体系设计探讨[J].中国建筑金属结构,2013(12):73.
[5]邓彩凤.浅析桥梁钢结构的防腐技术[J].中国建筑金属结构,2013(12):77.
[6]徐伟华.桥梁钢结构的大气腐蚀寿命预测[J].中国住宅设施,2010(2):58-59.
[7]赵清泊,李敏风.桥梁钢结构防腐蚀涂层配套和涂层使用寿命[J].电镀与涂饰,2010,29(8):64-68.
[8]丁国清,蔡建军,张波.桥梁钢结构的大气腐蚀特征[J].公路交通科技,2010,27(S1):63-66.
[9]韩东锐,张波,隋景堂,等.海工桥梁钢结构腐蚀监检测技术探讨[J].公路交通科技,2010,27(S1):106-108.
[10]王裕滔.浅析桥梁钢结构防腐蚀工程的发展现状及体系创新方案[J].科技资讯,2017,15(25):72,74.
[11]易辉,刘亢,宗振希.桥梁钢结构防腐涂装体系的选择[J].交通科技,2007(3):29-31.
[12]李运德,张亮,姜小刚,等.现代桥梁钢结构防腐涂层体系设计[J].电镀与涂饰,2011,30(1):57-62.
[13]刘攀.桥梁钢结构防腐涂层的老化失效机理和寿命预测研究[D].西安:长安大学,2008; 42-45.
[14] IrigoyneY,Jeom Kee Paik. Ultimate strength reliability analysis of corroded steel-box girder bridges[J]. Thin-Walled Structures. 2010(1):33-34.
[15] Alfrey,Lee,Wei. The effect of pitting corrosion on fatigue life[J]. Fatigue&Fracture of Engineering Materials&Structures.2008(7):65-68.
[16]潘兆基,闫五柱.桥梁结构防腐蚀层的失效影响因素分析[J].强度与环境. 2009(4):12-14.
[17]曾凡辉.铁路钢桥用重防腐涂料的研究与应用[D].长沙:湖南大学,2009,15:22-24.
[18]吕彭民.大型复杂结构抗疲劳设计[M].西安:陕西科学技术出版社,1999,72.
[19]佘娜,张思颖.低温升低收缩磷渣大体积混凝土温度应力监测数值仿真分[J].公路工程,2017(2):309-313,31.