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Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

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

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

Compensating Leads
By the use of compensating leads, formed of the same materia...

Drop Forging Dies
The kind of steel used in the die of course influences the he...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

Gears
The material used for all gears on the Liberty engine was sel...

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

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

The Modern Hardening Room
A hardening room of today means a very different place from ...



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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