David S. Peterson
“Fuzzy” Parts
We are noticing that some of the parts form a “fuzz” where they are machined. This area is white powder and when removed leaves a black spot on the surface of the tube that will not chromate.
Read MoreBlack Grease in Pickling Line
I very rarely get a grease-like substance clinging to the surfaces of parts after I remove them from the pickling bath.
Read MoreCause of Warping
We removed several belt guards and put them in our wheel blaster—a rotating table blaster. It removed the paint to perfection, but warped the parts so extensively that we had to hammer them back into shape.
Read MorePretreatment for Beryllium Copper
I am looking for a pre-treatment/cleaning process (preferably spray, as opposed to a dip method) for beryllium copper parts.
Read MoreFOLLOW-UP: Passivation Before Heat Treatment
I received a very good email from D.H. discussing the August 2007 question regarding the passivation and apparent rust on 17-4PH precipitation hardenable stainless steel.
Read MoreMeasuring Liner Thickness
Is there a non-destructive way to measure liner thickness in our centrifugal disc finisher?
Read MoreResidual Smut?
We’re having a problem with small cylindrical parts and small amounts of residual “smut” left over after our cleaning at an outside cleaning vendor.
Read MoreGraphite Grease Removal
We have to find a more economical way to do it while avoiding solvent usage for health and safety considerations. Do you have any suggestions?
Read MoreRust on 17-4ph
Could the customer’s rust be the thermal treating or just poor passivation, and to what extent can these parts be expected to rust if they are processed correctly but subjected to extreme conditions?
Read MoreClean Steel Using COR Rinse 404
We have been using cor rinse 404. Could you tell me if there are any issues with adhesion with different paints systems? How do you check if the metal is clean?
Read MoreRemoving Teflon Rings
We are chemical strippers and have a client who has a number of alloy units who wishes to remove a Teflon ring from one end. Is this possible?
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