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

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

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

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

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

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

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

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

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

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

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

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

Chromium
Chromium when alloyed with steel, has the characteristic func...

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

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

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

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

Nickel-chromium
A combination of the characteristics of nickel and the charac...

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



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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