Blog

1. Mechanical Polishing (Mechanical Polishing)

Craft Features:

• Stainless steel surfaces are polished with polishing wheels, belts or grinding paste to make them smooth and bright.

• Applicable to decorative uses requiring high gloss, such as home appliances, kitchenware, architectural decoration, etc.

Pros:

• The surface is bright and has high aesthetics.

• Remove slight scratches and oxide layers.

Disadvantages:

• The labor cost is high and it is not suitable for mass production.

• The gloss may be lost due to friction after long-term use.

---

2. Electropolishing (Electropolishing)

Craft Features:

• Remove the surface microscopic protrusions by electrochemical dissolution, making the surface smoother and brighter.

• Commonly used in high hygiene standards industries such as medical devices and food processing equipment.

Pros:

• Improving corrosion resistance and reducing surface attachments (such as bacteria, dirt).

• The surface is more uniform and there is no stress caused by mechanical polishing.

Disadvantages:

• The equipment costs are high and the process control is stricter.

• Not suitable for large artifacts.

---

3. Sandblasting

Craft Features:

• Use high-speed sand particles (such as alumina, glass beads) to impact the stainless steel surface to create a matte or matte effect.

• Supplementary for industrial equipment, building exterior walls, etc. where anti-glare or special texture is required.

Pros:

• Enhance the surface adhesion and is suitable for subsequent spraying or plating.

• Different roughnesses can be customized.

Disadvantages:

• The surface may remain sand particles and require subsequent cleaning.

• Long-term exposure to harsh environments may reduce corrosion resistance.

---

4. Brushed Finish

Craft Features:

• Use a sanding belt or wire drawing machine to create a uniform linear texture on the surface of the stainless steel to create a matte metal texture.

• Commonly in home appliances, elevator decoration, furniture and other fields.

Pros:

• Beautiful and fingerprint-resistant, suitable for products with frequent daily contact.

• Slight scratches can be hidden.

Disadvantages:

• The texture direction is fixed, and it is difficult to repair.

• Long-term friction may cause texture wear.

---

5. Chemical passivation (Passivation)

Craft Features:

• Use nitric acid or citric acid solution to remove free iron on the surface, enhance the protective layer of chromium oxide, and improve corrosion resistance.

• Applicable to medical devices, marine equipment, chemical equipment, etc.

Pros:

• Significantly improves rust resistance and extends service life.

• does not affect size and appearance.

Disadvantages:

• The acid concentration and time need to be strictly controlled, otherwise the surface may be corroded.

---

6. PVD coating (physical vapor deposition)

Craft Features:

• In a vacuum environment, ion sputtering is used to coat the stainless steel surface with titanium, chromium and other metals to form a color (such as gold, rose gold, black) or wear-resistant layer.

• Used in high-end decoration, watches, bathroom hardware, etc.

Pros:

• Rich in color, wear-resistant and corrosion-resistant.

• Environmentally friendly, pollution-free.

Disadvantages:

• The cost is high and it is not suitable for large-scale cheap products.

---

7. Electroplating (Electroplating)

Craft Features:

• Electrolytic coating of stainless steel with metals such as nickel, chromium, copper and other metals to enhance aesthetics or functionality.

• Commonly found in hardware, bathroom accessories, etc.

Pros:

• Provides high gloss or special color effects.

• Improve wear resistance.

Disadvantages:

• The coating may peel off, affecting long-term use.

• Some electroplating processes involve environmental pollution issues.

---

8. Pickling & Passivation

Craft Features:

• First use an acidic solution (such as hydrofluoric acid + nitric acid) to remove the welding oxide layer, and then passivation treatment.

• Suitable for welding stainless steel equipment, such as pipes, storage tanks, etc.

Pros:

• Thoroughly remove the scale in the welding heat-affected zone to restore corrosion resistance.

Disadvantages:

• Pickling waste liquid needs to be treated environmentally friendly.

---

How to choose the appropriate stainless steel 304 surface treatment process?

---

Conclusion

The surface treatment process of stainless steel 304 is diverse. Choosing the right process can improve product performance, extend service life and enhance aesthetics. Whether it is industrial applications or decorative purposes, understanding the characteristics of different processes can help you make better decisions.

If your project involves stainless steel 304 processing, please consult a professional surface treatment service provider for the best solution!

www.spanint.com