- This topic has 11 replies, 4 voices, and was last updated 4 years, 5 months ago by
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Hi Matt, Cadmium plating is by far the best choice, even if you want to paint it later on. It is Type 1 Cad plating (nicknamed white , silver or clear Cad). You want to order “Type 1 Cad plating” and “Baking”. The process of Cad plating builds in hydrogen into the base metal. This causes a condition named Hydrogen Embrittlement which make the base metal brittle. “Baking” disperses the hydrogen from the metal and eliminates the embrittlement issue.
I think you have the type hub which has a brass bushing pressed into the front of the hub ( under where the prop nut goes). That must be removed before sending it out for plating. It is not a tight fit and taps out with a light hammer and punch. Also the data tag should be removed ( if it is still there). The tag is held in by steel drive pins which are tapered with external ridges which “bite” into the base metal as they are driven into place. Usually, the drive pin are drilled all the way through the flange. You can take a small punch and use the hole to access the pins from the back side. Just tap them out and save them.
ST
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One more thing or two, To remove the rust use glass beads not sand blasting. Also do not use any automotive steel cleaner or etch. Those contain acids which weaken high carbon ( strong) steel. Best to just abrasive blast (glass) until all pits are clean.
As far as Cad plating sources. United Plating in Tulsa or Belmont Plating in Chicago are two companies we have used in the past. Be sure and contact them before and get an estimate. The pricing can vary ( widely) sometimes. You may also contact local prop shops and see who the use.
ST
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Here is what I learned. The number of hours heat treated is based on the hardness of the steel. The harder the steel the longer it takes to disperse the hydrogen. 1940’s steel is not as hard as today’s steel. When they Cad Plated these originally, they only baked for 3 hours. You can ask for any amount of baking time you want but 8 hours is recommended for this quality steel. So I will have it Magna fluxed first and if it passes I will have it Type 1 Cad plated then baked for 8 hours. I will check for and remove the brass bushing and data plate. They will do all other cleaning and surface prep.
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