How to treat the surface of stamped elbows

The purpose of surface treatment for stamped elbows is to improve their corrosion resistance (based on actual reports), performance, and aesthetics. Common treatment methods include the following:

Acid pickling and passivation

Principle: Use acid solution to corrode the surface of stamped elbows, remove impurities such as oxide scale and rust, and form a passivation film on the surface of the elbow to improve corrosion resistance (based on actual reports).

Operation process: Firstly, immerse the stamped elbow in an acid pickling tank, which is usually a mixed acid solution of hydrochloric acid, sulfuric acid, etc. The pickling time and temperature are determined based on the material and surface condition of the elbow. After acid washing, water washing is carried out to remove residual acid on the surface, and then passivation treatment is carried out. Generally, nitric acid or other passivation solutions are used to form a passivation film on the surface of the elbow. Afterwards, rinse with water again and dry.

Application scenarios: Widely used in stainless steel stamping elbows, as well as in pipeline systems in industries such as chemical, food, pharmaceutical, etc. that require high corrosion resistance (based on actual reports).

sand blasting

Principle: High speed abrasive (such as quartz sand, diamond sand, etc.) is sprayed onto the surface of the stamping elbow through compressed air, and the impact force of the abrasive is used to remove impurities, oxide scales, etc. on the surface, while forming a certain roughness on the surface, increasing the adhesion of the coating or plating layer.

Operation process: fix the stamping elbow in the sandblasting equipment, adjust the parameters such as sandblasting pressure, abrasive flow and spraying angle, and then start the equipment for sandblasting. Clean the abrasive and dust on the surface of the elbow after sandblasting.

Application scenario: Suitable for stamping elbows of various materials, commonly used for elbows that require anti-corrosion (based on actual reports) coating or thermal spraying treatment, such as oil and gas pipelines, as well as steel structure pipeline connection elbows in industries such as construction and shipping.

Hot dip galvanizing treatment

Principle: Immerse the stamped elbow into molten zinc solution to form a layer of zinc on the surface of the elbow, which can isolate air and moisture and provide anti-corrosion (based on actual reports).

Operation process: Firstly, pre-treatment is carried out on the stamped elbow, including acid washing, water washing, degreasing, etc., to remove impurities such as oil stains and rust on the surface. Then place the elbow into a zinc pot for hot-dip galvanizing, controlling parameters such as zinc liquid temperature and immersion time. After plating, remove the elbow and perform cooling and passivation treatment to improve the corrosion resistance of the zinc layer (based on actual reports).

Application scenario: Commonly used for ordinary carbon steel stamping elbows, it is widely used in industries such as building water supply and drainage, fire pipes, etc. It can effectively extend the service life of elbows and improve the quality of pipeline systems.

Painting treatment

Principle: Apply one or more layers of paint on the surface of the stamped elbow to form a protective film, isolate external corrosive media, and also serve a decorative purpose.

Operation process: First, clean the surface of the elbow to remove impurities such as oil and dust, and then apply primer, intermediate coat, and topcoat as needed. The painting methods include brushing, spraying, etc. It is necessary to control the thickness and drying time of the paint layer, confirm that the paint layer is uniform, free of bubbles, sagging and other defects.

Application scenarios: Suitable for stamping elbows in various environments, widely used in industries such as construction, machinery, and shipping. Different types of paints can be selected according to different usage environments and requirements, such as anti rust paint, anti-corrosion (based on actual reports) paint, high temperature resistant (based on actual reports) paint, etc.