Abstract
This report describes laboratory experiments to evaluate three proprietary corrosion inhibitors as additives to road de-icing salt. Test panels of both bare and painted mild steel were used; tests were carried out employing first an intermittent salt spray method and then an intermittent immersion method; and tests were carried out at temperatures of 25‹ and 5‹C. The inhibitors tested were sodium polymetaphosphate; emulsifier STH; and a commercial product called "Carguard" containing sodium chromate.