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How to Neutralize Bakers Fluid Flux.

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peter brown 525/11/2020 16:38:00
6 forum posts

Hi All

I am building a 5" Simplex and now soldering together the Lazer Model Engineers Kit using 1/4 " brass angle for extra support. I have strongly been advised to neutralize the Bakers Fluid flux, With what product and how best to proceed is my question? Any thoughts please.

old mart25/11/2020 16:43:56
2472 forum posts
169 photos

Rinse in hot water, repeat and the flux should be washed away.

Nigel Graham 225/11/2020 20:41:33
913 forum posts
16 photos

Would it be better to add washing soda (an alkali) to the first wash, to neutralise the acid?

Bill Pudney25/11/2020 21:14:07
483 forum posts
16 photos

Amongst many other things I build fuel tanks for model aeroplanes. These are tinplate fabrications soft soldered together using 50/50 plumbers solder and Bakers Fluid. The tanks must be pressure tested to ensure there are no leaks, then they are flushed out two or three times with a strong solution of hot water and bi carb soda. Then they are pressure rinsed with clean hot water, then dried as far as possible, obviously drying internally is a bit difficult. At this point the tanks are very clean and susceptible to rust, so the get a light spray with oil, inside and out.

Job done...........finally



Dave Halford26/11/2020 12:01:37
1142 forum posts
11 photos

The use of Bakers is not compulsory, I have use Laco, alledged not acid that will still cause fume rusting on nearby steel.

Best bet is rosin cored solder. Tin both sides first, wipe off any excess solder with a rag then join together.

peter brown 527/11/2020 18:22:48
6 forum posts

Thank-You to all those who replied to my query, the answers were a great help!!

Thanks Peter.

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