good products for cleaning steel prior to oven silver brazing

[Tmoose]

I did some searching on this forum and did not fine what I'm looking for.

We fairly successfully silver braze (some EZ braze filler) tungsten carbide tiles, and ferrous cast wear resistant pads to steel.
Assemblies from 3 to 10-15 lbs.

To prep the machined parts just prior to brazing we wire brush the surfaces, then run the parts thru an automated spray cleaner charged with some caustic cleaner.
My concern is many of these cleaners claim to leave a thin rust inhibitor film.

We are a getting ready to do a few "wetting" tests on parts cleaned with one of these products, so I may have my answer for this product in the next few days.
Regardless I'd like to know if folks have any proven favorites for final chemical cleaning prior to brazing.

thanks,

Dan T

 

[EdStainless]

You need to use a straight caustic and final rinse with hot high purity (DI) water.
And then braze immediately.
Are you using a braze paste?
I presume that there is a flux in the paste, or are you using a seperate flux?

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