- Patent Title: Surface-treatment solution composition containing trivalent chromium and inorganic compound, zinc-based plated steel sheet surface-treated using same, and method for producing same
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Application No.: US16339888Application Date: 2017-09-29
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Publication No.: US10822705B2Publication Date: 2020-11-03
- Inventor: Soo-Hyoun Cho , Won-Ho Son , Chang-Hoon Choi
- Applicant: POSCO
- Applicant Address: KR Pohang-si
- Assignee: POSCO
- Current Assignee: POSCO
- Current Assignee Address: KR Pohang-si
- Agency: Cantor Colburn LLP
- Priority: com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@5bfbe9a9
- International Application: PCT/KR2017/010918 WO 20170929
- International Announcement: WO2018/070720 WO 20180419
- Main IPC: B32B15/08
- IPC: B32B15/08 ; C23C22/42 ; C23C22/82 ; C09D5/08 ; C23C2/40 ; C23C22/40 ; C09D4/00 ; C23C2/06 ; C23C2/26 ; C23C22/05 ; C23C22/53

Abstract:
Provided is a surface-treating solution composition, a zinc-based plated steel sheet surface-treated using the same, and a method for producing the same, wherein the surface-treatment solution composition includes: 10 wt % to 20 wt % of a trivalent chromium compound containing chromium phosphate (A) and chromium nitrate (B), the content ratio thereof, A/(A+B), satisfying 0.3 to 0.6; 20 wt % to 40 wt % of a silane-based sol-gel resin in which three types of silane compounds are crosslinked; 0.2 wt % to 0.4 wt % of a rust-inhibiting and corrosion-resistant agent; 0.1 wt % to 0.3 wt % of a molybdenum-based compound; 5 wt % to 10 wt % of a water-soluble cationic urethane resin; 0.5 wt % to 2.0 wt % of a silane coupling agent; 0.5 wt % to 2.0 wt % of an Al compound; and 25.3 wt % to 63.7 wt % of water. The zinc-based plated steel sheet surface-treated with the surface-treatment solution composition containing trivalent chromium has an excellent effect on corrosion resistance, blackening resistance, fingerprint resistance, piping oil infiltration, and alkali resistance.
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