To provide a precoated steel sheet which excels in end face corrosion resistance and is adequate as a wiper material.
The steel sheet formed with a Zn-Al-Mg plating layer in which a primary crystal Al phase or the primary crystal Al phase and a Zn single phase coexist in a matrix of a ternary eutectic structure of Al/Zn/Zn2Mg is used as a base material. A chrome-free resin coating film dispersed with porous silica particles formed by bonding Ca ions by an ion exchange as a rust inhibitive pigment is formed on the surface of the base material through a chromium-free chemical conversion film in which an oxide or hydroxide and a fluoride of a valve metal whose oxide exhibits high insulation resistance coexist. Further, it is possible that the chemical conversion film contains a polyphosphate. The wiper with which the rust formation at a cut end face is suppressed and which has the excellent end face corrosion resistance even if the precoated steel sheet is cut and is formed to a prescribed shape can be obtained.
YANO HIROKAZU
MORI KOJI
| JP2001329383A | 2001-11-27 | |||
| JP2002194558A | 2002-07-10 | |||
| JPH11138690A | 1999-05-25 | |||
| JP2002187234A | 2002-07-02 | |||
| JP2002030458A | 2002-01-31 |
Wataru Ogura
Okada Manri
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