As atmospheric conditions continue to deteriorate, many decorative oxide films now include sulfur dioxide resistance as a mandatory test criterion, for example, in the housings of electronic and communication devices and in exposed aluminum decorative components of automobiles (such as sunroof rails). The SO₂ gas corrosion test is applicable to contact parts, connectors, and decorative components operating in atmospheric environments.
The sulfur dioxide‑resistant oxide film independently developed by San Yong demonstrates outstanding performance in resisting corrosion caused by sulfur dioxide gas, as fully confirmed by the following tests.