Ss Sheet 4mm 6mm 8mm 10mm 12mm 18mm 20mm No.1 Stainless Steel Plate 316 316L 316Ti 321 310

Stainless steel features:

Commonly used stainless steel surface treatment techniques include the following treatment methods: ① surface natural color whitening treatment; ② surface mirror brightening treatment; ③ surface coloring treatment.

1.2.1 Surface natural color whitening treatment: During the processing of stainless steel, black oxide skin is produced after coiling, edge binding, welding or artificial surface heating. This hard gray-black scale is mainly composed of two kinds of EO4, NiCr2O4 and NiF. In the past, hydrofluoric acid and nitric acid were generally used for strong corrosion removal. However, this method costs a lot, pollutes the environment, is harmful to the human body, and is highly corrosive, so it is gradually eliminated. There are two main methods of oxide scale treatment:

⑴Sand blasting (shot) method: mainly uses the method of spraying glass beads to remove the black oxide skin on the surface.

(2) Chemical method: Use a non-polluting pickling passivation paste and a non-toxic cleaning solution with inorganic additives at room temperature for immersion. So as to achieve the purpose of whitening the natural color of stainless steel. After processing, it basically looks like a matte color. This method is more suitable for large and complex products.

1.2.2 Stainless steel surface mirror bright treatment method: According to the complexity of stainless steel products and user requirements, methods such as mechanical polishing, chemical polishing, and electrochemical polishing can be used to achieve mirror gloss. The advantages and disadvantages of these three methods are as follows:

1.2.3 Surface coloring treatment: stainless steel coloring not only endows stainless steel products with various colors, increases the variety of designs and colors of products, but also improves the wear resistance and corrosion resistance of products.

Product of description

surface treatment

1 Cleaning and grinding: If there is any damage, it should be polished, especially the scratches and splashes caused by contact with carbon steel parts, and the damage caused by cutting slag must be carefully and thoroughly cleaned and polished.

2 Mechanical polishing: Use appropriate polishing tools for polishing, requiring uniform treatment, and avoiding over-polishing and re-scratching.

3 Degreasing and dust removal: Before pickling and passivating stainless steel parts, oil, scale, dust and other sundries must be removed according to the process.

4 Water blasting treatment: According to different treatment requirements, different micro glass beads and different process parameters should be selected, and overspraying should be avoided.

5 Pickling passivation: The pickling passivation of stainless steel parts must be passivated in strict accordance with the process requirements.

6 Cleaning and drying: After pickling and passivation, neutralization, rinsing and drying should be carried out in strict accordance with the process to completely remove the residual acid solution.

7 Protection: After the surface treatment of stainless steel parts is completed, protection should be done to avoid secondary pollution from personnel touching and oil, dust and other sundries.

8 Avoid reprocessing: After the surface treatment of stainless steel parts, reprocessing of the parts or products should be avoided.

Including: surface treatment of stainless steel/low carbon steel products such as chemical tankers, storage tanks, and pipeline boilers, such as grinding/polishing, pickling/passivation, inspection/supervision, technical consultation, etc.

The main service targets are shipbuilding, petrochemical and food equipment industries.

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