The photo shows a small amount of aluminum that was transferred to the root of the third thread on this 1/2″ x 1″ stainless steel bolt. The bolt was threaded into an aluminum extrusion that was submerged in lake water for about 5 months. The pH of the lake water is approximately 7.7.
This small amount of aluminum was enough to bind the bolt and make it very difficult to un-do.
The following link to Wikipedia provides an explanation of the process. http://en.wikipedia.org/wiki/Galvanic_corrosion
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