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Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Crankshaft
The crankshaft was the most highly stressed part of the entir...

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Alloying Elements
Commercial steels of even the simplest types are therefore p...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...



Preventing Carburizing By Copper-plating






Category: CASE-HARDENING OR SURFACE-CARBURIZING

Copper-plating has been found effective and must have a thickness
of 0.0005 in. Less than this does not give a continuous coating.
The plating bath used has a temperature of 170 deg.F. A voltage of
4.1 is to be maintained across the terminals. Regions which are
to be hardened can be kept free from copper by coating them with
paraffin before they enter the plating tank. The operation is as
follows:

Operation
No. Contents of bath Purpose
1 Gasoline To remove grease
2 Sawdust To dry
3 Warm potassium hydroxide solution To remove grease and dirt
4 Warm water To wash
5 Warm sulphuric acid solution To acid clean
6 Warm water To wash
7 Cold water Additional wash
8 Cold potassium cyanide solution Cleanser
9 Cold water To wash
10 Electric cleaner, warm sodium Cleanser to give good
hydroxide case-iron anode plating surface
11 Copper plating bath of copper Plating bath
sulphate and potassium cyanide
solution warm

There are also other methods of preventing case-hardening, one
being to paint the surface with a special compound prepared for
this purpose. In some cases a coating of plastic asbestos is used
while in others thin sheet asbestos is wired around the part to
be kept soft.





Next: Preparing Parts For Local Case-hardening

Previous: Carburizing By Gas



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