After processing and molding, the surface of stainless steel pipe fitting should pass a certain treatment to make more excellent performance of the stainless steel pipe fittings, say if the stainless steel pipe fittings that is not processed then its superiority is shown not to come out. So what treatment will you take to the surface of the stainless steel pipe fittings?
Usually the most common surface treatment methods have several: surface color bleaching processing, surface mirror guang liang treatment, surface coloring treatment.
Surface color bleaching processing: stainless steel in the process of machining, through rolled plate, edge, welding or through artificial surface fire heating processing, producing black oxide coating. The hardness of film of oxide skin mainly NiCr2O4 and NiF two EO4 composition, before the general removal using strong corrosion of hydrofluoric acid and nitric acid method. But this method cost, environmental pollution, harmful to human body, corrosion resistance, be being washed out gradually.
At present to scale processing method mainly has two kinds:
Sand blasting method (pill) : mainly adopt the method of spray micro glass bead, remove black oxide on the surface of the skin.
Chemical method: using a non-polluting pickling passivation paste and normal temperature non-toxic cleaning fluid with inorganic additives for baptism. To achieve the aim of bleaching processing stainless steel color. Handle is largely seems to be a light color. This method is useful for large, complex products is.
Mirror bright stainless steel surface treatment: according to the complexity of the stainless steel products and the user request is different respectively by mechanical polishing, chemical polishing and electrochemistry polishing method to achieve bright luster.
Surface coloring treatment: stainless steel coloring stainless steel products of various colors, not only increase the designs and varieties of products, and improve the wear resistance and corrosion resistance. Stainless steel coloring method has the following kinds:
1, chemical oxidation coloring
2, electrochemical oxidation coloring
3, ion deposition oxide coloring
4, high temperature oxidation coloring
5, gas phase cracking staining method
Source: China pipe fitting Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)