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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).
Issues and recommended procedures for chromium plating car cylinder bores.

Identifier  ExFiles\Box 132\4\  scan0233
Date  22th January 1940
  
COPY.
Rm.{William Robotham - Chief Engineer}
H1/EA-/SK.22.1.40. Laboratory.

RE : Chromium Plating of Car Cylinder Bores.

In connection with the plating of the 3 cylinder engine bores, a number of points have arisen which it would be as well to record for future reference.

The first attempt to plate these bores was unsuccessful, on account of slight bore corrosion, which had taken place underneath the grease with which the bores were coated on receipt. Great care should be taken to avoid this, otherwise difficulty is experienced in preparing the bores for plating. In the process of removing the defective chromium, all the enamel, paint etc., was removed from the cylinder and top half, in any case it would be preferable to defer any enamelling or painting until after plating on account of the powerful oxidising nature of the plating solution.

Some of the camshaft bearings were present in the above, and precautions had to be taken to avoid attack on these.

We suggest that, when a block is submitted for plating, the following conditions should be complied with, so far as is practicable.

Materials to be absent.
1. Enamel or paint, Bakelite etc.
2. Aluminium or its alloys.
3. Copper or its alloys.
4. White metal.

Other conditions.
Bores to be free from corrosion.
All covers, plugs etc. to be removed from coolant spaces to enable thorough washing to be carried out after plating.
No hollow fitments, likely to trap plating solution to be present.
  
  


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