Commonly used stainless steel flange surface treatment technology has the following several treatment methods:
① surface color whitening treatment; ② surface mirror bright processing; ③ surface coloring treatment.
1.2.1 surface color whitening treatment: stainless steel flange in the processing process, after the coil, bar edge, welding or artificial surface roasted heating treatment, resulting in black oxide. This hard gray-black oxide is mainly NiCr2O4 and NiF two kinds of EO4 ingredients, before the general use of hydrofluoric acid and nitric acid for strong corrosion method to remove. But this method cost, pollution of the environment, harmful to humans, corrosive, and gradually be eliminated. At present, there are two main ways to treat oxide scale:
⑴ sandblasting (pill) method: the main method is to spray micro-glass beads, remove the surface of the black oxide.
⑵ chemical method: the use of a pollution-free pickling passivation paste and non-toxic at room temperature with inorganic additives cleaning solution for immersion. So as to achieve the purpose of stainless steel flange whitening treatment. After dealing with the basic look is a matte color. This method is applicable to large, complex products.
1.2.2 stainless steel flange surface mirror bright treatment methods: According to the complexity of stainless steel flange products and user requirements are different mechanical polishing, chemical polishing, electrochemical polishing and other methods to achieve specular gloss. The advantages and disadvantages of these three methods are as follows:
1.2.3 Surface coloring: stainless steel flange coloring not only gives a variety of stainless steel flange products, increase the product variety, but also improve the product wear resistance and corrosion resistance.
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