Posted by Gordon England on March 07, 2004 at 13:15:52:
In Reply to: Hydrcholic acid posted by joe dufresne on March 07, 2004 at 02:03:50:
: Can you tell me what would be the best sealer to use on a HVOF coating, Stellite JK 6189 or JK 135, used in the envirement of Hydrocholic acid? And is there an alternative, or more cost effective one, like some kind of every day household wax or such? Thanks in advance.
Hi Joe
Microcrystalline wax is a very good sealer as long as the service temperature is kept below the wax melting point (80 C max)and hydrocarbon solvents and oils are not present. The part/coating is heated to above the wax melting point and the wax is then melted onto the coating. Metco did have a product called Metcoseal 185, it may still be available from Sulzer Metco. Household candle wax might work, but its melting point will be much lower and I'm not sure of the effect of the various other components of that wax.
Be aware that Stellite JK 6189 or JK 135 coatings will not be totally resistant to Hydrochloric acid environments.
Hope this helps.
Rgards Gordon
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