Japan Chemical Industries Co.

Toyota Jidosha Kabushiki Kaisha

Hideyuki Tami

Kazuhito Yaeda

Hiroyuki Arai

Mikito Nishii

Masamine Tanikawa

Shigehiko Sato

Hisaki Ito

Sadayoshi Suzuki

Yoshitaka Nakatani

A coolant composition having anticorrosion properties against both aluminum and magnesium is provided. A coolant composition comprises a melting point depression agent selected from glycols and alcohols as the main component, and it contains a corrosion inhibitor selected from fluorides and a tribasic acid of an organic carboxylic acid or an alkali metal salt thereof.

1,3,5-benzene tricarboxylic acid coolant composition

A liquid coolant composition with improved anti-corrosive property contains 85-99 weight % of an agent for lowering the melting point selected from the group consisting of alcohols and glycol, and 1-15 weight % of a rust preventive composition. The rust preventive composition contains 0.00005-0.02 weight % at elemental metal concentration of calcium compounds or a mixture of 0.00005-0.02 weight % each of calcium and magnesium compounds, and at least one kind of rust preventive selected from the group consisting of phosphates, borates, nitrates, molybdates, benzoates, silicates, triazoles, thiazoles, sebacic acid and octylic acid. Still better results are obtained if 0.001-0.02 weight % of at least one kind of polyphosphoric or polycarboxylic acids is additionally contained.

Liquid coolant compositions with anti-corrosive property containing

Growing community of inventors

Shizuoka, Japan

Hideyuki Tami