| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a zinc phosphate chemical conversion treatment liquid with which a coating film satisfying coating performance can be formed and the generation amount of sludge can be reduced. <P>SOLUTION: The chemical conversion treatment liquid for a metal material is used for depositing a zinc phosphate coating film on the metal material in a chemical conversion treatment. The liquid is an aqueous solution containing 500-4,000 ppm of phosphoric acid ions and 300-1,200 ppm of zinc ions and having a pH of 3.6-4.4, wherein the coefficient K (K=10<SP>X</SP>×P<SP>2</SP>×Z<SP>3</SP>/10<SP>18</SP>) is within the range of 1-50 (wherein P[ppm] is a phosphoric acid ion concentration; Z[ppm] is a zinc ion concentration; and X is pH). <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
