David S. Peterson
Welding Through Lubricant on Cold-Rolled-Steel Tube/Cleaning
Question: I have been asked to clean some parts made from corrosion resisting steel.
Read MoreStainless Steel Handles Brazing—Leaves Stain
Question: We are manufacturing stainless steel mugs and the handles are attached to the mugs by a brazing process.
Read MorePrecleaning for Laser
Question: We produce some small parts of CDA 798-2 Nickel-Silver that require laser stenciling.
Read MorePickling Stainless Steel Components
Question: We are manufacturing SS components which we are pickling in HF/HNO3 soln for approx three mins.
Read MorePowder Coating in China
Question: I have what is an increasingly prevalent problem. Our company is purchasing powder coated mild steel automotive piece parts from a factory in China. This factory has a zinc phosphate pretreatment process. We are using a high-quality paint manufactured by a major paint supplier in China, allegedly the same paint we use successfully at our own facility in California. The paint adhesion test results are very good; the salt spray tests are horrible, less than 200 hours.
Read MorePassivation of 316L SS
Question: Do you know of a procedure for using citric acid at ambient temperature for passivation of 316L SS?
Read MoreCaustic Bath for Pre-copper Plating
Can you help me come up with the amounts of caustic potash and potassium cyanide that you need to makeup a caustic bath to use to neutralize acids from parts prior to copper plating them.
Read MoreRegarding Triethanolamine
Question: I have a question regarding use of Triethanolamine (TEA) in cleaners.
Read MoreRemoving Graphite Residue
Question: Do you know of any equipment that would remove graphite residue from the graphite piece?
Read MoreReplacing Chromic Acid
Question: We epoxy powder coat a product line that is about 50% brass, 25% bronze and 25% nickel-plated brass.
Read MoreZinc Phosphate vs. Manganese Phosphate
Question: For many years we have used a heavy-zinc phosphate and oil treatment for our Tees that have a high-interference API 8RD thread that is installed on oil well tubing.
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