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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).
Methods for creating protective coats on iron and steel, comparing linseed and mineral quenching oils.

Identifier  ExFiles\Box 38\6\  Scan157
Date  23th January 1919
  
R.H. 235A. (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13.

C O P Y.

Mr Clark.
January 23rd, 1919.

H13/B23119.
Laboratory.

X3424 RE PROTECTIVE COATS FOR IRON AND STEEL ETC.

Quenching out in Linseed oil gives good results, but the oil tends to perfume the air to a greater extent than when using mineral oil. Keeping the furnace full of steam during the heating is inclined to be an advantage, as it makes the oxide coat more resistant to corrosion owing to the formation of a more impermeable coat of magnetic oxide of iron. Slightly higher temperature (say 450 o C), gives a rather thicker coat.

A simple method of keeping the atmosphere of the furnace moist, or even nearly saturated with steam, is to have either a steam pipe discharging into the muffle, or an introduction of water, by dropping in a box of coke or charcoal within the furnace. I send you at the same time as this, samples of treated steel that have all been subjected to 48 hours of moist air, and ^(rusting test) are labelled as to their treatment.

[Handwritten]
Small bar from 400°c (furnace) in mineral oil
Large bar from 400°c in linseed oil
Hdb
  
  


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