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Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

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 ...

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

Furnace Data
In order to give definite information concerning furnaces, fu...

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

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Crucible Steel
Crucible steel is still made by melting material in a clay or...

Hardness Testing
The word hardness is used to express various properties of me...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Care In Annealing
Not only will benefits in machining be found by careful anne...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

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

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

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

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

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

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

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



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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