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

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

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

Bessemer Process
The bessemer process consists of charging molten pig iron int...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

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

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

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

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

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

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

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...



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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