The purpose of this investigation was to obtain basic informa¬tion on the rust-inhibiting, or metal-passivating, properties of nine chromate-type pigments.na. Salt-free zinc chromate and barium-potassium chromate pro¬vided the best corrosion inhibition for steel and aluminum exposed to rural and marine atmospheres. Normal lead, strontium, and zinc tetroxy chromates were also good in these applications.nb. Salt-free zinc, zinc tetroxy, calcium, and strontium chro¬mates showed the most promise for incorporation in primers for mag¬nesium exposed to rural and marine atmospheres.nc. Zinc tetroxy chromate was the best pigment for use in primers for steel in water immersion. Basic lead, barium, normal lead, and salt-free zinc chromates deserve further investigation.nd. Zinc tetroxy, salt-free zinc, regular zinc, and strontium chromates showed the most promise for water-immersible primers for aluminum.ne. Strontium, calcium, and barium chromates were the most promising for water-immersible primers for magnesium; barium-potassium chromate deserves further consideration.
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