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Black Spots On SG Cast Iron
We plate SG iron castings in a zinc acid chloride plating bath and then chromate with a classic hexavalent yellow chemical conversion bath. We recently we tried a trivalent yellow conversion coating, but after processing 30–40 jobs we observe black patches on the jobs immediately after processing. Is it possible that the iron impurities from the casting contaminate the chemical conversion bath and if so, how we can control the process?
Read MoreChemical Quality and Electroless Nickel
Since switching our supplier of sodium sulfide and sodium hypophosphite used in our electroless nickel plating baths, we have had problems such as brown stains and plating out of nickel on the tank walls. Do you have any suggestions for resolving these problems?
Read MoreHow to Fix Stripping Gold
We selectively strip gold from using a reel-to-reel process. Quite often, the gold that remains after the stripping process is a dark, brown-gold color. Do you have any suggestions for how to fix this problem?
Read MoreOverheated Nickel Sulfamate
We use a nickel sulfamate plating bath with a temperature range of 50–60°C to plate low stress micro-layers. Recently the temperature was allowed to reach 70°C. Did we ruin the plating bath because of this temperature upset? Can the plating bath be salvaged?
Read MoreZinc Plating and Food Contact
Can you recommend an alternative finish that will withstand the caustic cleaners and be allowed for food contact?
Read MoreFake Saliva
We are in need for a standard formula for artificial saliva. Are you aware of any such formulation?
Read MoreArcing In A Barrel
When we plate stamped parts made of light gage material some of the parts are burned on the surfaces. We do not have this with heavier parts. Why?
Read MoreHULL CELL 101
Can you supply me with some information or references on performing Hull Cell tests? Also, why is the cell designed to hold 267 mL of solution?
Read MoreShakudo Plating
I wish to plate shakudo onto a copper substrate. The parts will than be patinated resulting in a dark purple/black color. Is this possible?
Read MoreCleanup of Organics
How does one go about using potassium permanganate to clean up the organics in a nickel sulfamate plating tank?
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