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acid pickling and passivation in steel casting foundry

Verify that all safety equipment is available and in good condition (gloves, goggles, apron).

Ensure that the pickling tank is clean and free of contaminants.

Check that the temperature and concentration of the pickling solution are within recommended ranges.

Make sure that the steel castings are free of any oil, grease, or dirt.

Immerse the steel castings in the pickling solution for the recommended time.

Periodically check the condition of the castings to ensure that the pickling process is progressing smoothly.

Rinse the castings thoroughly with clean water to remove any residual acid.

Inspect the castings for any signs of corrosion or other imperfections.

Prepare a passivation solution according to the manufacturer's instructions.

Ensure that the passivation tank is clean and free of contaminants.

Verify that the temperature and concentration of the passivation solution are within recommended ranges.

Check that the steel castings are thoroughly cleaned and free of any residue from the pickling process.

Immerse the steel castings in the passivation solution for the recommended time.

Periodically check the condition of the castings to ensure that the passivation process is progressing smoothly.

Rinse the castings thoroughly with clean water to remove any residual passivation solution.

Inspect the castings for a uniform and corrosion-resistant surface finish.

Inspect the steel castings for any signs of corrosion or imperfections.

Document the pickling and passivation processes, including solution concentrations, immersion times, and any deviations from the standard procedure.

Label the castings with the date of pickling and passivation for traceability.

Store the castings in a clean and dry environment to prevent contamination.

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