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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Radiator blocking, proposing modifications to the use of sodium phosphate as a corrosion inhibitor.

Identifier  ExFiles\Box 27a\3\  Scan094
Date  1st December 1929
  
X4516
Hy.{Tom Haldenby - Plant Engineer} Hs.{Lord Ernest Hives - Chair} [text struck through]
H12/EA3.12.29.
Laboratory.

Re Blocking of Radiators.

It was not considered likely that the addition of 1 1/2 ozs., (equivalent to about 0.1%) of sodium phosphate would seriously modify the frothing tendency, if condensed steam water or tap water were used in the R.R. car radiator. It appears, however, that some trouble has been experienced, especially if more than 1 1/2 ozs. of sodium phosphate has been added. Since this is the case, some modifications of the scheme to be tried experimentally could be :-

(1) The use of less sodium phosphate. (the addition of 1 tablet every month instead of 3 tablets (1 1/2 ozs) every three months).
(2) The use of the di-hydrogen sodium phosphate instead of the ordinary hydrogen phosphate. This would tend to increase the surface tension of the solution.

We are trying out (2) from the corrosion reduction point of view.

H1. HE
  
  


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