摘要
珠江三角洲水资源配置工程内衬钢管内防腐采用环氧粉末施工工艺,内衬钢管内径为4800 mm,且外带间距1.2 m、高度120 mm的加劲环,为控制环氧粉末涂层成型质量,满足环氧粉末喷涂时涂覆区域温差不大于±10℃的工程要求,解决因外设加劲环吸收大量热量而带来的涂覆区域温度不均匀等问题,该文采用“机械喷砂、吹扫+中频感应内加热+加劲环补温+粉末回收”相结合的技术手段,基于表面预处理、加热以及粉末喷涂3方面措施对环氧粉末的涂覆全过程进行质量控制,最终生产出外观平整、色泽均匀、无气泡、无开裂及缩孔、无漏点、厚度在450μm以上、抽检附着力达到20 MPa的环氧粉末涂层,质量符合工程质量要求。
For the anti-corrosion of the lined steel pipes in the Pearl River Delta Water Resources Allocation Project,epoxy powder construction process was adopted.The lined steel pipe has an inner diameter of 4800mm and the outer with a spacing of 1.2m,height of 120mm stiffening ring.In order to control the quality of epoxy powder coating molding,meet the epoxy powder spraying coating area temperature difference of not more than±10℃of the project requirements,and solve problems such as uneven temperature in the coating caused by the external stiffening ring absorbing a large amount of heat,this paper adopts the combination of“mechanical sand blasting,blowing+medium frequency induction internal heating+stiffening ring temperature+powder recycling”technical means,based on the surface pretreatment,heating and powder coating these three measures on the epoxy powder coating in the whole process of quality control,and the epoxy powder coating with smooth appearance,uniform color,no bubbles,no cracks and shrinkage holes,no leakage,thickness above 450μm,and adhesion up to 20MPa in sampling test was finally produced,and the quality was in line with the requirements of engineering quality.
作者
余学良
林江涛
吴海宏
YU Xueliang;LIN Jiangtao;WU Haihong(Guangdong Construction Engineering Group Co.,Ltd.,Guangzhou 511340,China)
出处
《广东水利水电》
2025年第9期79-84,共6页
Guangdong Water Resources and Hydropower
基金
广东省重点领城研发计划(第四批)项目(编号:2019B111108001)。
关键词
大直径钢管
熔结环氧粉末
防腐施工
中频感应加热
large-diameter steel pipe
fusion bonded epoxy powder
anti-corrosion construction
medium-frequency induction heating
