(1) Experimental method
1 plating A3 steel plate from the alkaline plating solution containing nickel l% ~ l5%
2 Passivation paint The plating is passivated or phosphatized by chromate and dip coated with acrylic varnish, polyurethane varnish and amino baking paint, respectively.
3 Corrosion test:
a. The impregnation with 5% NaCl aqueous solution was used to measure the change of electrode surface potential and soaking time.
b. The test piece was hung in the 600mm position above the 40% hydrochloric acid tank, and the relative humidity was 80%. The change was observed by the acid mist corrosion.
c. Potentiodynamic scanning (1 mV/s) was used to measure the anodic polarization curve in 5% sodium chloride solution after painting of different coatings.
(2) Test results
1 After coating the film with the same conditions, the corrosion resistance of the zinc-nickel alloy coating containing 10% to 15% of nickel is superior to that of the nickel-containing zinc nickel alloy coating containing 1% to 3% of nickel.
2 In a 5% sodium chloride solution, the passivated and painted coating is more stable than the phosphatized and painted coating.
3 The ability of resistance to hydrochloric acid mist, passivated zinc-nickel alloy coating is stronger than the phosphating treatment.
4 Nickel-nickel alloys containing 10% to 15% nickel in a wide range of passivation potentials under anodic polarization conditions.
5 In the 5% sodium chloride solution, the paint film first peeled off, and then the plating corrosion occurred.
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