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GALVANIC CORROSION IN 7075 ALUM

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hAVING PROBLEMS IN A CNC MACHINE WITH THIS WOULD COATINGS ON THE TOOL HOLDERS WORK TO PREVENT THIS? uSED ZINC IN THE COOLANT STORAGE AREA WITH ON AVAL.
 
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Try anodising the part that is corroding.
Determine the PH of the coolant solution that is probably acting as an electrolyte and alter it to a range between 4 and 9, this may help.
 
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