Invention Grant
- Patent Title: Reactive-type chemical conversion treatment composition and production method of member with chemical conversion coated surface
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Application No.: US14797035Application Date: 2015-07-10
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Publication No.: US09915006B2Publication Date: 2018-03-13
- Inventor: Yoshiki Hiramatsu
- Applicant: YUKEN INDUSTRY CO., LTD.
- Applicant Address: JP Aichi
- Assignee: YUKEN INDUSTRY CO., LTD.
- Current Assignee: YUKEN INDUSTRY CO., LTD.
- Current Assignee Address: JP Aichi
- Agency: Nakanishi IP Associates, LLC
- Main IPC: C23C22/30
- IPC: C23C22/30 ; C23C22/46 ; C25D5/48 ; C25D3/22 ; C25D5/50 ; C23C22/40 ; C23C22/53 ; C23C22/00

Abstract:
A production method of a member having a surface provided thereon with a chemical conversion coating includes a contacting step and a washing step. The contacting step causes a reactive-type chemical conversion treating acidic composition to contact with a base material having a metal-based surface thereby forming a chemical conversion coating on the metal-based surface of the base material. The washing step washes the base material having been subjected to the contacting step to obtain a member having a surface provided thereon with the chemical conversion coating. The reactive-type chemical conversion treating acidic composition contains a water-soluble trivalent chromium-containing substance, a water-soluble titanium-containing substance, and a carboxylic acid compound. The acidic composition is free from a water-soluble cobalt-containing substance.
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