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钢结构腐蚀原因与重防腐涂层

发布时间:2015-8-29 9:11:45 浏览次数:605



金属腐蚀按照腐蚀机理可以分成3类:

1)金属高温气体腐蚀,在高温(500~1000℃)下,钢材容易被氧化破坏,在表面生成氧化铁皮。
2)化学腐蚀,即干腐蚀,指环境中没有液相或凝露现象存在情况下产生的腐蚀。
3)电化学腐蚀,即湿腐蚀,指有液体(水)存在,即电解质溶液接触的腐蚀过程。在冶金工业厂房钢结构中,电化学腐蚀最为严重。重防腐涂料指能在恶劣腐蚀环境下应用并具有长效使用寿命的涂料。金属与非金属防护理论、现代表面技术、新兴合成材料、防锈颜料、先进的涂装设备、现代检测技术等科学技术的发展为重防腐涂料提供了良好的技术物质条件,推动了重防腐涂料的进步和发展。

   现在冶金工业厂房中使用的重防腐涂料主要有氯化橡胶涂料、醇酸树脂耐酸涂料、氯磺化聚乙烯涂料、玻璃鳞片涂料、环氧树脂自流平涂料、富锌涂料等类型。使用重防腐涂料的目的是保护钢材表面免受外界环境影响,延长钢材基体使用寿命。其机理是防腐涂料中的防锈颜料和成膜剂形成致密的防锈涂层,使涂层首先受到外界作用的影响,保护钢材不受腐蚀,延缓钢材开始受到腐蚀的时间。目前,我国重防腐涂料生产技术基本成熟,产品质量已达到相关技术要求。提高钢结构防腐水平,需要在施工质量方面采取有效措施。


Metal corrosion in accordance with the corrosion mechanism can be divided into three categories:

1) metal hot gas corrosion, under high temperature (500 ~ 1000 ℃), steel easy to oxidative damage, tin oxide generated in the surface.

2) chemical etching, the dry etching, which have no liquid or gel environment corrosion phenomenon existence conditions.

3) electrochemical corrosion, the wet etching, refers to the presence of a liquid (water), the electrolyte solution of contact corrosion process. In the metallurgical industry workshop steel structure, electrochemical corrosion is most serious. Heavy-duty coating refers to applications in severe corrosive environment and has a long-term service life of coating. Metal and nonmetal protection theory, modern surface technology, new synthetic materials, antirust pigment, advanced coating equipment, modern testing technology such as the development of science and technology as heavy anti-corrosion coatings provides good material conditions, promote the progress and development of heavy-duty coating.

Now heavy-duty coating is mainly used in the metallurgical industry workshop with chlorinated rubber paint, alkyd resin acid coatings, chlorosulfonated polyethylene coating, glass flake coating, epoxy self-leveling type of paint, zinc-rich coatings, etc. Use heavy-duty coating purpose is to protect the steel from external environment influence, prolong the service life of the steel substrate. Its mechanism is antirust pigment in anticorrosion coating and film former form dense antirust coating, the coating is affected by the outside effect, first to protect the steel from corrosion, delay the steel from corrosion time to start. At present, China's heavy-duty coating basic mature production technology, product quality has reached the technical requirements. Improve the level of steel structure corrosion, it is necessary to take effective measures in terms of construction quality.


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