Immersion Testing of Protective coating is carried out by this method ASTM D6943-10.To protect the substrate from corrosive attacks and stored material from contamination protective coatings are used. It is applied on Metallic, Concrete, containers, dams, rail cars etc.
Scope:
This practice establishes procedures for the evaluation of the resistance of industrial protective coatings to immersion in chemicals.
Test Procedure:
Method A—Evaluation of specimens under conditions of constant temperature at atmospheric pressure, (that is, without a thermal gradient).
Method B—Evaluation of specimens under conditions that provides a temperature gradient across the sample: The temperature may increase from coated side to the uncoated side (Method B1) or decrease from coated side to the uncoated side (Method B2).
Method C—Evaluation of specimens under conditions of constant temperature and increased pressure, (that is, without a thermal gradient).
Specimen Size:
Carbon steel panels with a minimum test size of 50 by 100 mm (2 by 4 in.), minimum thickness 3 mm (1⁄8 in.).
Data :
After the immersion test changes were observed in colour or turbidity of the immersion medium and the presence of any precipitates or changes in pH where applicable.
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