ENVIRONMENTALLY FRIENDLY ALUMINUM COATINGS AS SACRIFICIAL COATINGS FOR HIGH STRENGTH STEEL ALLOYS

摘要

Electroplating process is described for coating a ferrous alloy steel cathode substrate with an aluminum coating, the process comprises: a) immersing an aluminum anode substrate in a plating bath formulation comprising: a source of aluminum, an ionic liquid, a brightening agent, and a metal-salt compound; b) etching the cathode substrate by immersing it into the aluminum plating bath and conducting an anodic polarization step; c) electroplating the etched cathode substrate with the aluminum plating bath formulation; and d) rinsing with alcohol and water, and drying. Preferably, the process further comprises a heat treatment applied to the aluminum coated ferrous steel alloy obtained in step d).

主权项

1. An electroplating process for coating a ferrous alloy steel cathode substrate with an aluminum coating, characterised in that the process comprises:
immersing an aluminum anode substrate in an aluminum plating bath formulation comprising:
a source of aluminum,an ionic liquid,a brightening agent, anda metal salt; etching a ferrous steel alloy cathode substrate by immersing it into the aluminum plating bath formulation and performing an anodic polarization; electroplating the etched ferrous alloy steel cathode substrate with the aluminum plating bath formulation, to form an aluminum coated ferrous steel alloy, wherein electroplating is carried out with a current density ranging from 1 mA/cm2 to 100 mA/cm2, at a temperature ranging from 20° C. to 100° C. and under a dry inert gas; and rinsing the aluminum coated ferrous steel alloy.