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Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

The Thermo-couple
With the application of the thermo-couple, the measurement of...

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

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

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

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

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

Hardening
Steel is hardened by quenching from above the upper critical....

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

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

The Forging Of Steel
So much depends upon the forging of steel that this operation...

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



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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