Seamless stainless steel pipe passivation

Seamless stainless steel pipe passivation is a metal treatment technology designed to protect the substrate from oxidative corrosion by forming a stable passivation film on the metal surface. ‌This treatment technology is especially suitable for stainless steel pipes. ‌By reacting with the passivating agent, ‌forms a dense layer of film on the surface of the stainless steel with good covering properties, ‌ thereby effectively preventing direct contact between the metal and the corrosive medium, ‌ achieving prevention corrosive effects. ‌Stainless steel passivation liquid is the main tool for implementing this technology. ‌It has the following characteristics and advantages: ‌

1. Wide applicability: ‌Applicable to all stainless steel products of SUS200, ‌SUS300, ‌SUS400 series. ‌

2. Easy to operate: ‌Easy to use, ‌just soak the stainless steel products in the passivation liquid, ‌no special processing equipment and strict additional conditions are required, ‌effectively reducing costs. ‌

3. Corrosion resistance is significantly improved: ‌According to ASTM B-117 and DIN EN ISO 9227 neutral salt spray test standards, ‌Corrosion resistance is increased by 5 to 20 times. ‌1L passivation solution can treat about 60㎡ of stainless steel surface. ‌
4. High stability: The passivation liquid is a stable agent that will not decompose or precipitate, and is easy to transport and store for a long time. ‌
5. Wide application: ‌Widely used in aerospace, ‌mobile communications, ‌glasses, ‌watches, ‌auto parts and other industries. ‌

For the passivation treatment of seamless stainless steel pipes, ‌general steps and methods include:‌

Mechanical treatment: ‌Ensure the pipe surface is clean and free of impurities, ‌remove surface dirt and oxides through grinding, ‌sandblasting, etc. ‌
Pickling treatment: Use strong acid solutions such as dilute sulfuric acid or dilute hydrochloric acid to clean surface oxides and impurities to promote the formation of a passivation film. ‌
Chemical treatment: Form a protective passivation film on the surface through soaking method, spraying method, etc. ‌
Electrochemical treatment: ‌Use electrochemical principles to form a dense oxide film on the surface of stainless steel, ‌such as anode protection, ‌anode passivation and other methods. ‌

Choosing the appropriate treatment method is crucial to ensure good passivation results. ‌In addition, after ‌SS316 stainless steel pipe is pickled and passivated, ‌its corrosion resistance is significantly improved, ‌especially suitable for environments with a lot of chloride ions.

When performing passivation treatment, it is necessary to select appropriate treatment methods according to different situations and ensure that the treatment process is standardized to obtain good passivation effects. In addition, protective measures need to be taken after passivation treatment to extend the service life of stainless steel pipes.

Application areas of seamless stainless steel pipes:

Stainless steel seamless pipes have a wide range of applications, covering multiple industrial fields and specific uses. ‌

1. Petrochemical industry: Seamless stainless steel pipes play an important role in the petrochemical industry. They are used to transport oil, gas and other fluids to ensure the purity and safety of the fluid medium. ‌
2. Medical industry: ‌ Due to the good corrosion resistance and hygienic performance of stainless steel, ‌ seamless stainless steel pipes are widely used in the manufacture of medical equipment, ‌ ensuring the hygienic standards of the medical environment and the purity of the fluid. ‌
3. Food industry: ‌ During food processing and storage, ‌ seamless stainless steel pipes are used to transport water and food raw materials to ensure food safety and hygiene. ‌
4. Light industry: In the light industry, seamless stainless steel pipes are used for the connection of production equipment and the transportation of fluids to improve production efficiency and product quality. ‌
5. Mechanical instrument industry: Seamless stainless steel pipes are used for the connection of mechanical instruments and fluid transportation, ensuring the normal operation and accurate measurement of mechanical equipment. ‌
6. Automobile industry: ‌In automobile manufacturing, ‌seamless stainless steel pipes are used to manufacture auto parts, ‌such as exhaust systems, etc., to improve the performance and durability of the car. ‌
7. Construction industry: Seamless stainless steel pipes are also used for fluid transportation in the construction industry, such as heating and cooling water transportation. ‌
8. Decorative and structural uses: In addition to industrial applications, seamless stainless steel pipes are also widely used in decoration and building structures, providing dual effects of beauty and practicality. ‌

In addition, ‌seamless stainless steel pipes are also used in geological drilling, ‌ship manufacturing, ‌automobile half-shaft casing and other fields to meet the special needs of specific industries.

Go here to learn more: Stainless steel pipe fittings vs Carbon steel pipe fittings