do zinc plated bolts react with aluminum 227.5

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Galvanized steel screws, however, are plated with a corrosionresistant coating, usually consisting of zinc, that is not nearly as reactive with aluminum. The zinc plating prevents the underlying steel from coming into contact with the aluminum, and the risk of corrosion of the aluminum is reduced significantly.

LeJeune Bolt Company ASTM Coatings Bulletin Form 0308303 Zinc/Aluminum Coatings for use with Structural Fasteners May 2015 Background There has always been a need among users of structural fasteners for coatings that can safely and cost effectively provide corrosion protection. Traditional metallic coatings, like galvanizing to ASTM B695

While hot dip galvanized zinc coated bolts might be fine, in my own experience most commercial 39zinc plated 39 bolts, having 0.0002quot of zinc plating or even less , are going to rust fairly soon outdoors on their own even if insulated from all other metals. I 39d suggest type 316 stainless fasteners.

In the case of zinc and aluminum, there is only a slight chance of a reaction because of the relatively small change in potential between the two metals and the formation of an insulating film on the surface of the aluminum. One of the key factors in the reaction between dissimilar metals is the contact surface area.

Instead, fasteners are coated with a thin layer of zinc, typically via electroplating, in a process known as zinc plating. Zincplated fasteners have been common for only about 40 years. It shows that mechanical fastener technology continues to evolve to meet modern appli ions and expectations, despite the basic principles being over 2,000 ...

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