PLATING ON LEADED STEEL
One type of steel, 12L14, a leaded steel, continually gives us problems with blisters and peeling. Do you have any suggestions as to how we can solve this ongoing problem?
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Q. Our shop plates a number of different steels using a zinc cyanide plating bath. One type of steel, 12L14, a leaded steel, continually gives us problems with blisters and peeling. Do you have any suggestions as to how we can solve this ongoing problem? L.F.
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A. Leaded steels like 12L14, which contains 0.15 –0.35% lead, are produced to allow enhanced machinability. Essentially, the lead smears on the part surface during the machining process and acts as a lubricant. For platers, the problem with these leaded steels is simple: If the lead is not completely removed from the surface, you will not obtain a satisfactory deposit.
The following cycle should remove the lead on the surface and give you good results:
1) Soak clean to remove oil and grease.
2) Clean anodically at a current density of 90–100 ASF in a strong alkaline cleaner.
3) Dip in an acid such as acetic, fluoboric or glycolic acid. Proprietary acids are also available for this purpose.
Rinse thoroughly between each step.
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