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Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

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

Corrosion
This steel like any other steel when distorted by cold worki...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

Critical Points
One of the most important means of investigating the properti...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

Sulphur
SULPHUR is another element (symbol S) which is always found i...

Hardening
The forgings can be hardened by cooling in still air or quen...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...



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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