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Quoted from uncivil_engineer:it looks like corrosion.
Corrosion is the answer, galvanic corrosion. When two different metals are in contact and exposed to a common electrolyte, one of the metals experiences accelerated corrosion while the other is protected. In your example, it’s likely something like copper in the dust that is more noble then the steel or zinc in the other component, which results in the formation of a galvanic cell.
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Hilliard, OH