| abstract |
FIELD: metallurgy. ^ SUBSTANCE: invention relates to metal material with treated surface free from chrome. Metal material has the surface to which there applied and dried is water-based matter so that composite coating is obtained. Water-based matter includes silica-containing organic compound (W) obtained by mixing silaned binding substance (A) containing one amine group in molecule/and silaned binding substance (B) containing one glycidyl group in molecule, at weight ratio of solid matters [(A)/(B)] 0.5- 1.7, and the molecule of which has at least two functional groups (a) of the formula -SiR1 R2 R3, in which R1, R2 and R3 represent alkoxyl group or hydroxyl group; at least one represents alkoxyl group and one or more at least of the same type of hydrophilic functional groups (b) chosen from hydroxyl group which is different from the group, which can be included in functional group (a)and amine groups with molecular-weight average of 1000-10000, at least one fluor compound (X) chosen from fluorotitanium acid or fluorozirconium acid, phosphoric acid (Y), and vanadium compound (Z). Weight ratio of solid matters [(X)/(W)] of the coating is 0.02 - 0.07, [(Y)/(W)] is 0.03- 0.12, [(Z)/(W)] is 0.05- 0.17, and [(Z)/(X)] is 1.3- 6.0. ^ EFFECT: material meets the requirements for corrosion resistance, heat resistance, resistance to fingerprints, conductivity, capability of coating application, and has resistance to blackening during operation. ^ 4 cl, 17 tbl, 68 ex |