Evaluation on Corrosion Resistances of Various Surface-treated Materials

Abstract

Eight kinds of surface treatments, including widely known zinc electroplating and chemical conversion film treatment, were applied to smoll-size coiled springs, sheet springs and straigth-line wires, and their corrosion resistances were evaluated.
The testing methods were the salt spray test, air-exposing test, fatigue test and their conbinations, and the following results were obtained.
1. The properties of a variety of surface teratment methods were roughly understood.
2. The corrosion resistances and behavior of the various surface treated materials were made clear.
3. Differences in resulting corrosion-resistance evaluation due to the testing methods and correlations between them-for example, obvious correlation between the air-exposing day and the salt spray time-were clarified.