| 摘要 |
There is disclosed a water-base coating composition and method for its use that forms a readily strippable protective film on metal surfaces. The composition includes a film former ingredient which is a terpolymer of polyvinyl butyral, polyvinyl alcohol and polyvinyl acetate. The water-base coating composition also contains a fugitive corrosion inhibitor, i.e., a corrosion inhibitor having a sufficient vapor pressure to impart corrosion resistance to surfaces coated with the film former composition. Suitable corrosion inhibitors are aromatic triazoles such as benzotriazole. A leveling agent such as morpholine is used to prevent the film from pulling from the edges during drying. Morpholine is particularly advantageous as it extends the working time when coating objects, and prevents the dispersion from clogging nozzles of spraying equipment. Morpholine also contributes to the corrosion inhibition of the coating.
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