Historical Articles

February, 1953 issue of Plating

 

Question Box—readers’ questions of general interest

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Q. 151. Could you tell us whether an article or study has beer published concerning the influence of warm phosphating on the mechanical qualities of steel?

A. The subject of phosphate-coated steel was discussed at the Boston Convention of the A. E. S. and reported in the 37th Annual Proceedings (1950), pp. 251 - 255.—A. KORBELAK.

Q. 152. Can you advise us regarding a strip to remove chrome plated deposit over metal parts made from-zinc sheet or zinc strip?

A. With regard to your letter requesting information as to how to strip chromium from zinc sheet we are inclined to believe that this cannot be done. We know of no one who does it and the chemistry of these metals would make the problem a very difficult one to solve.
However, if you have copper, nickel and chromium over the zinc, the problem can be solved by reverse etching in almost concentrated sulfuric acid at room temperature. This takes off the chromium and nickel. Then polish the copper and replate.—Louis DONROE.

Q. 153. We have a problem of silver-plating small metal stampings in small quantities at irregular intervals. In general, it is necessary to do each lot at once, so that they cannot be accumulated for a larger batch. Could you let us know if a very small plating barrel or similar equipment is available that could be held in a ready condition at all times to take care of small batches?

A. We believe a small Lucite portable plating barrel will solve your problem of silver plating small quantities of metal stampings, something of the order of 6 inch x 12 inch. (The names of suppliers were provided.)—D. G. FOULKE.

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