Hi all, I have met with the following problem. Our customer, a large automotive producer, now during holiday season, prolonged the exposure of Alu blocks with these chips that are hardly accessible, from 1 shift to 2-3 (during weekend)-it just stays freely on the line. Normally, they are washed away in further steps. But now, these chips get dry and make very uneasily removable crusts, and one can also watch the rust traces of corrosion likely galvanic type where two metals with different potential are in touch, on Al block (engine). Is there any chance to prevent these phenomena by MWF parameters adjustment? Here, 40-50% mineral oil containing MWF is used, boron free-mostly used for Al, but also in small extent for cast iron on this line, conc. ca 10%, hardness ca 50 dGH, pH 8.1. Does adding water softener and increasing pH (MEA, f.i.), or another additive make any sense?