Nickel Plating Aluminum Galvanic Corrosion

There are three conditions that must exist for galvanic corrosion to occur.

Nickel plating aluminum galvanic corrosion.

Galvanic corrosion also called bimetallic corrosion or dissimilar metal corrosion is an electrochemical process in which one metal corrodes preferentially when it is in electrical contact with another in the presence of an electrolyte a similar galvanic reaction is exploited in primary cells to generate a useful electrical voltage to power portable devices. Iron group metals nickel cobalt iron nickel plating is among the most common electrodeposition processes and is used mostly as a part of a multilayered system designed to increase wear and corrosion resistance and also able to function as a diffusion barrier. The plating is typically electroless nickel and then gold. Zangari in encyclopedia of interfacial chemistry 2018.

The chart below shows how different plating materials react to one another with regard to their galvanic potential. Electroless nickel plating can provide a robust solution to corrosive attack across a range of corrosive mechanisms including galvanic corrosion chemical attack and erosion. Electroless nickel plating en can be applied to a wide range of basis metals including steel copper brass and aluminum alloys. Galvanic corrosion some times called dissimilar metal corrosion is the process by which the materials in contact with each other oxidizes or corrodes.

I am having plating problems such as visible peeling and blistering and voiding in areas. Note that ni is more noble than low carbon steel essentially iron and. First there must be two electrochemically dissimilar metals present.