Invention Grant
- Patent Title: Phosphate solution for zinc or zinc-based alloy plated steel sheet, and zinc or zinc-based alloy plated steel sheet using the same
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Application No.: US14758170Application Date: 2012-12-28
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Publication No.: US09957619B2Publication Date: 2018-05-01
- Inventor: Young-Jin Kwak , Kyung-Hoon Nam , Yong-Hwa Jung , Tae-Yeob Kim , Dong-Yoeul Lee , Seok-Won Cho , Young-Ra Lee , Mun-Jong Eom , Woo-Sung Jung , Seok-Jun Hong , Jae-Kyu Min , Hong-Kyun Sohn
- Applicant: POSCO
- Applicant Address: KR Pohang-si, Gyeongsangbuk-do
- Assignee: POSCO
- Current Assignee: POSCO
- Current Assignee Address: KR Pohang-si, Gyeongsangbuk-do
- Agency: McDermott Will & Emery LLP
- Priority: KR10-2012-0154286 20121227
- International Application: PCT/KR2012/011746 WO 20121228
- International Announcement: WO2014/104442 WO 20140703
- Main IPC: C23C18/16
- IPC: C23C18/16 ; C23C18/48 ; C23C18/31 ; C23C22/42 ; C23C28/00

Abstract:
A phosphate solution for a zinc or zinc-based alloy plated steel sheet, and a zinc or zinc-based alloy plated steel sheet using the same are provided. The phosphate solution for a zinc or zinc-based alloy plated steel sheet contains a molybdenum (Mo) ion, a calcium (Ca) ion and a phosphate ion. A zinc or zinc-based alloy plated steel sheet includes a base steel sheet, a zinc-based or zinc alloy-based plating layer formed on the base steel sheet, and a phosphate film formed on the zinc-based or zinc alloy-based plating layer. The phosphate film contains a molybdenum compound, Ca and a phosphate. A pitting phenomenon occurring at the time of treating a steel sheet with a phosphate is prevented, and excellent corrosion resistance is exhibited on a phosphate film.
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