Diamond Shamrock Corporation

Nippon Dacro Shamrock Co., Ltd.

Takao Higashiyama

Toshio Nishikawa

Michiaki Nakazato

An improved anticorrosion coating composition is disclosed. The composition is characterized in that in the known anticorrosion coating composition comprising a chromic acid compound or a chromic acid compound and a boric acid compound, a powder of zinc, aluminum of an alloy of a mixture thereof, a (poly)glycol compound and solvent, a part of chromic acid compound ingredient is replaced by a water-soluble nickel and/or cobalt compound. The composition exhibits a better corrosion protection performance in more severe corrosion environment than the known anticorrosion coating composition with lesser content of harmful hexavalent chromium.

Anticorrosion coating composition

An anticorrosive coating composition comprising particulate metal, a chromic acid constituent, at least one organic liquid substance and a pH modifier if necessary, in which a part of the chromic acid constituent is replaced with boric acid component, is disclosed. Resulting coatings over metal substrates display excellent corrosion-resistant properties in fresh water environments as well as in salt water environments.

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Yokohama, Japan

Takao Higashiyama