There are many ways to degrease the surface of C-section steel, usually related to the equipment of galvanizing production line. The two need to adapt to each other. There are several ways to degrease C-beam before electroplating.

　　有机溶剂脱脂。有机溶剂脱脂实际上是皂化油和不皂化油在有机溶剂中的溶解过程。钢铁制品在机械加工过程中，其表面往往附着较厚的油膜，直接化学处理比较困难，通常采用有机溶剂处理。本方法不适合去除电焊C型钢表面附着的油污。

　　Degrease with organic solvent. Degreasing by organic solvent is actually the dissolving process of saponified oil and unsaponifiable oil in organic solvent. In the machining process of iron and steel products, the thick oil film is often attached to the surface, which is difficult to be treated directly by chemical treatment. This method is not suitable for removing the greasy dirt on the surface of C-beam.

　　化学脱脂。一般是指用碱液和碱盐溶液去油。这种脱脂过程是一个复杂的物理化学过程。它是由油膜在表面活性剂和碱的作用下产生的。碱性水溶液去除钢表面油脂的机理。

　　Chemical degreasing. Generally, it refers to the use of alkali solution and alkali salt solution to remove oil. This degreasing process is a complex physical and chemical process. It is produced by oil film under the action of surfactant and alkali. The mechanism of removing grease from steel surface by alkaline aqueous solution.

 

　　目前，C型钢热镀锌前的脱脂主要采用化学清洗的方法。脱脂剂也可以循环使用，这有助于脱脂。在循环系统中应该安装一个分离器，将油脂从脱脂液中除去。为了清洁C型钢表面，在从脱脂液中去除C型钢之前，应先去除脱脂液的表面。

　　At present, chemical cleaning is mainly used to degrease C-steel before hot galvanizing. Degreasers can also be recycled, which helps to degrease. A separator shall be installed in the circulation system to remove grease from the degreasing solution. In order to clean the surface of C-section steel, the surface of degreasing liquid should be removed before removing C-section steel from degreasing liquid.

　　电化学脱脂。电化学脱脂是将氢从阴极析出或将氧从阳极析出，机械剥离附在c型钢表面的油膜，加速油脂乳化的过程。电解脱脂法根据被清洁物体的电极极性可分为阳极电解脱脂法、阴极电解脱脂法和混合极性电解脱脂法。

　　Electrochemical degreasing. Electrochemical degreasing is a process of separating hydrogen from the cathode or oxygen from the anode, mechanically stripping the oil film attached to the surface of C-steel, and accelerating the oil emulsification. According to the electrode polarity of the cleaned object, the electrolytic degreasing method can be divided into anode electrolytic degreasing method, cathode electrolytic degreasing method and mixed polarity electrolytic degreasing method.

　　一般情况下，C型钢表面的润滑脂较少。炉焊管是在高温下形成的，在精加工过程中可能会接触到油脂，但这是可以避免的，通常不需要脱脂工艺。焊接时管道与油脂接触机会大，表面常附着在套管油脂上，如果没有脱脂工艺，会给酸洗带来困难，甚会污染酸洗液。总之，是否采用脱脂，要根据C钢表面原料的具体情况而定。

　　Generally, there is less grease on the surface of C-section steel. The furnace welded pipe is formed under high temperature, and it may contact with grease during finishing, but this can be avoided, and generally no degreasing process is required. During welding, there is a great chance for the pipeline to contact with the grease, and the surface is often attached to the casing grease. If there is no degreasing process, it will bring difficulties to pickling and even pollute the pickling solution. In a word, whether to use degreasing depends on the specific situation of C steel surface materials.