Patent ID: 7585379

Claim:
A baking finishing formula for carbon steel screws, comprising: a. metallic zinc solution with a concentration of 5-10 grams per liter and an ion particle size of 25-75 microns in diameter; b. metallic nickel solution with a concentration of 0.2-0.5 grams per liter and with an ion particle size of 100-200 microns in diameter; c. metallic aluminum solution with a concentration of 10-20 grams per liter and an ion particle size of 15-25 microns in diameter; d. a fluoride-containing surfactant with a concentration of 0.2% and corresponding to polyethylene glycol; e. a plurality of corrosion inhibitors in a mixture of succinic anhydride, n-butylamine, n-octylamine, n-decylamine and n-dodecylamine; f. polyethylene glycol with a concentration of 30-50 grams per liter and with a molecular weight of 2000-10000; and g. a mixed-type additive with a concentration of 10-60 ppm.