US2017356090A1PendingUtilityA1

Composition for phosphate film optimizing mn content and a method for phosphate treatment of zn electric-plated steel sheet

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Assignee: HYUNDAI MOTOR CO LTDPriority: Jun 8, 2016Filed: Nov 23, 2016Published: Dec 14, 2017
Est. expiryJun 8, 2036(~9.8 yrs left)· nominal 20-yr term from priority
Inventors:Jae Woong Choi
C23C 22/78C23C 22/182C25D 3/22C25D 7/0614C25D 5/48C23G 5/00C01P 2002/85C23G 1/14C23C 22/73C23C 22/07C23C 22/62
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Claims

Abstract

A composition for a phosphate film of a Zn electric-plated steel sheet may comprise zinc (Zn), nickel (Ni), and manganese (Mn), wherein a content of Mn is 6 to 8 wt %.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A composition for a phosphate film of a Zn electric-plated steel sheet comprising zinc (Zn), nickel (Ni), and manganese (Mn), wherein a content of Mn is 6 to 8 wt %. 
     
     
         2 . The composition for the phosphate film of the Zn electric-plated steel sheet of  claim 1 , wherein a molecular size of the phosphate is 1.5 to 2.5 μm. 
     
     
         3 . The composition for the phosphate film of the Zn electric-plated steel sheet of  claim 1 , wherein a coating weight of the phosphate film coated on the Zn electric-plated steel sheet is 1.6 to 2.0 g/m 2 . 
     
     
         4 . The composition for the phosphate film of the Zn electric-plated steel sheet of  claim 1 , wherein the composition for the phosphate film comprises Zn 2 Mn(PO 4 ) 2 4H 2 O and Zn 2 Fe(PO 4 ) 2 4H 2 O. 
     
     
         5 . A Zn electric-plated steel sheet coated with the composition for the phosphate film of  claim 1 . 
     
     
         6 . A method for coating a phosphate film on a Zn electric-plated steel sheet, comprising steps of:
 forming the phosphate film on a Zn electric-plated steel sheet by treating the composition for the phosphate film of  claim 1 ; and   washing the Zn electric-plated steel sheet with the phosphate film.   
     
     
         7 . The method for coating the phosphate film on the Zn electric-plated steel sheet of  claim 6 , further comprising:
 degreasing, surface-modifying, and washing the Zn electric-plated steel sheet before forming the phosphate film.   
     
     
         8 . The method for coating the phosphate film on the Zn electric-plated steel sheet of  claim 7 , wherein a surface modifier for modifying a surface of the Zn electric-plated steel sheet is a Zn surface modifier and a concentration thereof is 2.0 to 3.5%.

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