4C™ as Hot for superior dry Phosphate

One Step Replacement for Phosphating Fasteners (Hot)

One step De-scaling/Treatment by heated Process

Steps to test for use on heat treated fasteners: (Not limited to only: just a good example)

1. Pour enough 4C in a pyrex(R) glass beaker (Or 316 Stainless or Pyrex dish for other parts) - enough to cover parts going in and heat it to around 140ºF. Dip the heat treated fasteners (with heat treated scale) in 4C (note: if there is any oil on the fasteners, then remove the oil completely by some other de-greaser first).
2. For nasty oil and grease, one method (very EPA friendly) is heated sodium hydroxide (lye, for example)
3. (small amount) into water.
4. You will see gassing/bubbling on the surface of the fasteners. Perform the pickling for 5 to 7 minutes. 4C will remove all heat scale, rust etc. and provide a protective coating for very long-term corrosion resistance.
5. On parts with no heat scale, some of it will be deposited to form the look of Parkerizing,
6. As in Zinc - Gray to charcoal gray (almost black) look. But for a clean room environment, no oil.
7. Remove the fasteners and wipe off all of the excess chemical on the surface with a lint free cloth.
8. And then air dry (can also be heat dried - as in an oven per the other directions).

1. Since 4C does not etch the surface, there will be no metal removed from the metal or the threads.
2. Also, the coating thickness is negligible.
3. The coating will dry to a smooth dry-feeling surface.
4. The 4C coating:
• a. Is a completely (electrically) conductive conversion coating and
• b. Becomes a part of the metal surface itself (covalent bonds to the surface).
• c. It provides for powerful anti-rust agent
• d. Contamination free surface. (Nothing to out-gas as in phosphate and oil).

• Preliminary lab tests were performed following the above process and then subjected to the salt spray test (ASTM B117). It passed 20 hours of salt spray test (to red rust).
• Any other steel in the same room can be prepared with the same process, if long term corrosion resistance is needed without any top coating.
• The hot process is superior to cold process 4C - so when 10X or greater performance is needed, the Hot 4C process is superior, just as Hot Dip Galvanizing is superior to standard Galvanizing (And Hot costs more but is superior for external applications.)
• See pictures for before and after.

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