abstract |
It is 100~5000mg/m to surface of cold-rolled steel plate with the adhesion amount of Zn 2 Mode implement Zn plating, after washing, make above-mentioned cold-rolled steel sheet contact with the aqueous solution containing P.Now, the P concentration containing P aqueous solution is 0.001~2g/L, and temperature is the scope of 30~60 DEG C. |