David S. Peterson
Cleaning Pre-Shot Peen
I am wondering what is commonly done to clean newly machined aluminum parts prior to shot peening?
Read MoreEvaluating Acid Concentration by Titration
When performing a titration to evaluate the acid concentration we get a coalescing of black material in the solution as the end point is approached. Does anyone have an idea what this substance may be? Any suggestions?
Read MorePlaforization Performance
Do you know how many hours of salt spray we can get out of a Plaforization system?
Read MoreResponse to Spray Wand Phosphatizing
I read in the June 2006 addition of the Parts Cleaning Clinic your answers to the Phosphate Cleaning Systems question, where someone was using a spray wand phosphatizer at a pH of 2.0 and wanted to increase their quality (www.pfonline.com/articles/clinics/0606cl_clean3.html). Hopefully, I can add to your answers:
Read MorePros and Cons for Ambient Temp Pretreatment
Can you explain to me the pro’s and con’s of room-temperature-pretreatment?
Read MorePretreatment of Multiple Substrates
Is there any one method and chemical/solvent that could be used to clean all these situations?
Read MoreCleaning Welds
I would like to know where I purchase the equipment to passivate weld seams on stainless steel, I do not want to dip the parts, I would like to hand passivate.
Read MorePretreatment
I am setting up a new Batch operation and wanted to know which pretreatment to go with. A 3 stage dipping system, or is a 3 stage hot pressure cleaning solution wash, Clear Rinse and sealant? Will the Iron railings benefit from a 3 minute dipping more than a power wash manually?
Read MorePhosphate Cleaning Systems
The issues I currently have are as follows: (1) I have a pH level of 2.0, that I think is causing flash rust to occur and in turn some slight delamination of paint during scribe testing. What is suggested to control pH? (2) I’ve read that when cleaning you should wash from bottom to top; this seems counter-intuitive to me. Can someone explain? (3) I’m sure the wheel has been invented on controls and work instructions for manual phosphating so does anyone have any links to a location that I can get our’s off of? (4) Does the metal temperature need to reach a certain temperature for the coating reaction to take place or only the solution?
Read MoreWhich Solvents to Use
Although I know each solvent has its own evaporation rate and solvent power, why do most formulators use more than two types. For example, why would toluene, MEK, MIBK, xylene be used in one paint formulation? Couldn’t I get a specific evaporation rate, viscosity, sprayability, VOC’s, etc. by just using MIBK and MEK? Or are xylene, toluene or other solvents having more of a major play in a formulation than a carrier?
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