Abstract
EC Test was conducted on Cu-Ni-Cr platings of various thicknesses, and the number of color spots (caused by corrosion) developed on the surface of each specimen was measured as far as possible. The relation between the number of developed color spots in EC Test and R.N. (Rating Number) was obtained on the assumption that CASS Test for 16hrs. is equivalent to EC Test for 2min. for the same specimen. Then, it was proved that the conventional two spot color developing method means 8.0 of R.N..
Furthermore, the values obtained by the above method were compared with those obtained by the weathering tests commonly conducted in Nagoya District. As the results, it was found that R.N. determined by EC Test will give proper values which are acceptable.
