The corrosion resistance of the film includes water resistance, heat resistance, damp heat resistance, salt spray resistance, acid and alkali resistance, gasoline resistance, and lubricating oil resistance. This performance test, for the steel drum industry, can be tested for targeted projects. In particular, the paint inside the steel drum can be tested for the items to be filled in the inner coated steel drum.
The method is to apply a coating on a hemispherical 120 mm long carbon steel rod with a diameter of 10-12 mm, a small hole in the non-spherical shape, and a nylon rope in the small hole. The above method of preparing a coating film may be employed, or a dip coating method may be employed. It is required to apply more than two layers, and the total thickness is greater than 80 μm.
Dip the dried sample film stick into the liquid to be filled in the steel drum. After a certain period of time, take it out and rinse it with clean water, then check the film condition. In general, the immersion time is more than 3 months, the film is intact, can be considered qualified, can also be immersed in a constant temperature of 55 ° C for two weeks for rapid testing, for reference.