EFFECT OF ELECTRICAL INSULATION MATERIALS ON PROTECTIVE METAL FINISHES UNDER CONDITIONS OF HEAT AND MOISTURE.
ROCK ISLAND ARSENAL ILL
Pagination or Media Count:
An investigation was made of the effects of certain AIEE, Class O90C and A105C electrical insulation materials on protective metal finishes. Sleevings, tapes, varnishes, insu lated wires, and insulation paper were evaluated in contact with and in confined close proximity to bare steel, uncoated aluminum, anodized aluminum, and cadmium and zinc with and without chromate treatment. Temperatures and initial relative humidities utilized were 1602F and 100 R.H., and 2002F and 50 R.H. Sleeving materials in general were the most corrosive and insulated wires the least corrosive insulation material. Zinc with and without chromate treatment was most susceptible to corrosion by the insulation materials tested and anodized aluminum the least affected metal. The greatest amount of corrosion occurred at a test temperature of 200F. Author