Surface treatment solution composition containing trivalent chromium and inorganic compound, and method for manufacturing hot dip galvanized steel sheet surface-treated using same

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United States of America

PATENT NO 12221702
APP PUB NO 20210388504A1
SERIAL NO

17288232

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Abstract

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Provided is a surface treatment solution composition comprising: 30 to 51 wt % of a trivalent chromium compound comprising chromium phosphate (A) and chromium nitrate (B) and having a content ratio of A/(A+B) that satisfies 0.3 to 0.6; 5 to 15 wt % of silane coupling agent; 0.2 to 3 wt % of vanadium-based anti-corrosive rust inhibitor; 3 to 12 wt % of colloidal silica; 0.5 to 5 wt % of polysiloxane copolymer; and 14 to 61.3 wt % of water, a hot dip galvanized steel sheet surface-treated using same, and a manufacturing method thereof. The hot dip galvanized steel sheet treated with the surface treatment solution composition containing trivalent chromium has an excellent corrosion resistance, blackening resistance, pipe-forming oil reactivity, and alkali resistance.

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Patent Owner(s)

  • POSCO CO., LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Cho, Soo-Hyoun Pohang-si, KR 14 25
Lee, Kang-Min Gwangyang-si, KR 50 440

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