Stainless steel has a unique strength, high wear resistance, corrosion resistance and superior Stainless steel ball can not rust and other excellent features. It is widely used in chemical industry, food machinery, electrical and mechanical industries, environmental protection industry, household appliances and home decoration industry, finishing industry, giving people a gorgeous noble feeling.
The development of stainless steel applications will be more and more widely, but the development of stainless steel applications to a large extent determine the surface of its development of copper ball technology.
1 stainless steel surface treatment methods commonly used
1.1 Introduction to stainless steel varieties
1.1.1 stainless steel The main components: generally contain chromium (Cr), nickel (Ni), molybdenum (Mo), titanium (Ti) and other high-quality metal elements.
1.1.2 Common stainless steel: a chromium stainless steel, containing Cr ≥ 12% or more; nickel-chromium stainless steel, with Cr ≥ 18%, containing Ni ≥ 12%.
1.1.3 from the stainless steel microstructure Stainless steel ball structure Category: Austenitic stainless steel, for example: 1Cr18Ni9Ti, 1Cr18Ni11Nb, Cr18Mn8Ni5. Martensitic stainless steel, such as: Cr17, Cr28 and so on. Commonly known as non-magnetic stainless steel and with magnetic stainless steel.
1.2 Common stainless steel surface treatment methods commonly used stainless steel surface treatment techniques have the following treatment:
① surface color whitening treatment;
② surface mirror bright processing; ③ surface coloring.
1.2.1 surface color Albino: Stainless steel in the process of processing, after the coil, bar edge, welding or heating after artificial baking surface, resulting in black oxide skin. This hard gray black oxide mainly NiCr2O4 and NiF EO4 two components, the former generally used hydrofluoric acid and nitric acid to remove the strong corrosion method. However, this method is costly, polluting the environment, harmful to human beings and is more corrosive and gradually being eliminated.
Currently there are two main ways to deal with 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 non-polluting pickling passivation paste and non-toxic at room temperature with inorganic additives cleaning solution for dipping. To achieve the true nature of stainless steel whitening purposes. After handling basically looks a dull color. This method is suitable for large and complex products.
1.2.2 stainless steel mirror surface bright processing methods: According to the complexity of stainless steel products and user requirements may be different using mechanical polishing, chemical polishing, electrochemical polishing and other methods to achieve the mirror gloss.
The advantages and disadvantages of these three methods are as follows:
1.2.3 Surface Coloring: Stainless steel coloring not only gives a variety of colors of stainless steel products, increase product color varieties, but also improve product wear resistance and corrosion resistance.
Stainless steel coloring methods are as follows:
⑴ chemical oxidation coloring;
⑵ electrochemical oxidation coloring;
⑶ oxide deposition oxide coloring;
⑷ high temperature oxidation coloring;