Regarding the stainless steel pickling passivation process specification in the storage tank production process

1. Subject content and scope of application

This regulation specifies the requirements, methods and precautions for the cleaning of oil stains and rust stains on the surface of stainless steel containers (including parts and components), and deep cleaning and degreasing.

This regulation is applicable to the pickling passivation treatment of chromium and nickel austenitic stainless steel containers manufactured by our company.

2. Pickling and passivation process

Degreasing and cleaning dirt net-clean water flushing-deep cleaning degreasing and degreasing, clean water flushing-blow dry

3. Preparation before deep cleaning

3.1 Personnel and protection

3.1.1 Operators should be trained in safe operation before they start to work, and can handle emergency situations correctly.

3.1.2 You should wear neatly before operation, and you must wear rubber gloves, rubber shoes, masks, hats and protective goggles.

3.2 Workpiece

3.2.1 Pickling and passivation pretreatments can only be carried out for the stainless steel containers or parts after the manufacturing is completed according to the requirements of the drawings and process documents, and the specified items are checked and qualified.

3.2.2 Clean up the welding seam and the welding slag and spatter on both sides. The surface of the machined parts of the container should be gasoline or cleaning agent to remove oil stains and other dirt.

3.2.3 When removing foreign objects on both sides of the weld, use a stainless steel wire brush, stainless steel spatula or grinding wheel to remove it, and rinse it with clean water (chloride ion content in the water does not exceed 25mg/l) after removal.

3.2.4 When the oil pollution is serious, use 3-5% alkali solution to remove the oil pollution and rinse it with clean water.

3.2.5 The oxide scale of hot-worked stainless steel parts can be removed by mechanical sandblasting. The sand must be pure silicon or alumina.