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Discussion on Surface Treatment Technology of Stainless Steel

DataTime:[2017-8-10]

(1) preface:

It is well known that stainless steel has its unique strength and high abrasion resistance and its excellent anti-rust properties. It is widely used in chemical industry, food machinery, electromechanical industry, household electrical appliance industry. At present, a lot of entering the home decoration industry, giving people the feeling of luxuriant nobility.

The application of stainless steel will be more and more widely available, but the application of stainless steel will largely determine its surface treatment technology. Let me talk about the surface treatment of stainless steel for discussion.

(2) introduction of stainless steel varieties:

Stainless steel usually contains high quality metallic elements such as chromium (CR), nickel (NI), molybdenum (MO) and titanium (TI). Common stainless steel is chromium stainless steel, which contains CR > = 12%. Nickel chromium stainless steel contains CR > = 18%, including NI > = 12%. From the stainless steel metallographic structure: the austenitic stainless steel, for example: 1CR 18 NI9TI, cr18ni11nb. Martensitic stainless steel, such as CR17, CR28, etc. It is commonly referred to as non-magnetic stainless steel and magnetic stainless steel.

(3) surface treatment of stainless steel:

At present, the surface of stainless steel surface is treated with white treatment. (2) the surface mirror is polished. (3) surface shading treatment.

In the process of processing, the stainless steel is processed by the coil plate, the edge, the welding, or the handling by the agent. The hard, black, black oxide skin is mostly NICR2O4 and NIF two, the EO4 component, which was previously used in a strong corrosion method with hydrofluoric acid and nitric acid. But this method is costly, polluting the environment and harmful to the human body. The corrosion was larger and gradually eliminated.

There are two methods for the treatment of this type of oxidation: (1) the use of the blasting method. (2) adopt the chemical method.

It is used to wash the cleaning liquid with an inorganic additive with non-contaminated pickling paste and normal temperature. Thus, the purpose of whitening the stainless steel. It basically looks like a look. This method is suitable for large and complex products.

Stainless steel surface gloss treatment:

According to the complexity of the stainless steel products and user requirements is different respectively by mechanical polishing, chemical polishing and electrochemistry polishing method to achieve mirror Shi Guangze. Here are three ways to make a choice:

Table 1

Project method

advantage

Disadvantages

Applicable Products

Remarks

Mechanical polishing

Good leveling, bright

Labor intensity, serious pollution, complex pieces difficult to process, shiny decline, high investment and cost

Simple parts, medium and small products, complex parts can not be processed

The whole product gloss is not consistent, shiny to keep time is not long

Chemical polishing

Less investment, complex pieces can throw, high efficiency, fast

Lack of brightness, polishing fluid to humidification, gas spill, the need for appropriate equipment

Complex products, low brightness requirements of the product can be used

Small batch processing is more cost-effective

Electrochemical polishing

Up to the mirror glossy, long-term maintenance, process stability, less pollution, low cost, good pollution prevention

One-time investment large, complex parts to be installed equipment, auxiliary electrodes, mass production to cool

Dirt products, requiring a long time to keep the mirror light, bright products

Stable process, easy to operate, can be widely used

Stainless steel is not only used in the color of stainless steel, it also increases the color of the product, and increases the durability and wearability of the products.

The stainless steel coloring method has the following: (1) ionic deposition oxide or oxide. (2) high temperature oxidation. (3) chemical oxidation. Electrochemical oxidation. (4) the gas phase cracking method.

A brief description of various methods is summarized as follows:

(1) ion deposition oxide or oxide method, is put stainless steel workpiece in the vacuum evaporation plating in vacuum coating machine, such as: titanium plating hand watch case and band. It is usually golden. This method is suitable for mass production. Because investment is big, cost is high, small batch product is not economical.

(2) the high temperature oxidation method is in particular molten salt, the workpiece stays in certain scope of process, the workpiece to form a certain thickness of oxide film, and present a different color.

(3) chemical method is in particular solution, the color of the membrane, are formed by chemical oxidation generally have used "by law", but need to be able to guarantee a batch of product colour and lustre is consistent, must be controlled by reference by telex.

(4) electrochemical method, which is used in a particular solution, by electrochemical oxidation.

(5) gas phase cracking, which is more complicated, is less applied in industry.

(4) description:

This paper briefly introduces the method of surface treatment of stainless steel, which is specific to the requirements of the products and which method to choose. Depending on the product, the material and the surface requirements are different. Choose to implement the feasible work plan. Since the formula for the process is trade secret, it is not easy to write here, please understand.

Source: China Stainless Steel Pipe Manufacturer - Yaang Pipe Industry Co., Limited (www.yaang.com)

Tel No:+86-18267732328 / Email:[email protected]
Address:Longwan District, Wenzhou, Zhejiang Province, China.

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