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Decreases Die Casting Soldering and Galling
A
MetaLLife
surface has a natural ability to retain lubricant so that a barrier exists
between the two elements that can cause soldering to occur. This in
itself, can help to retard soldering. In more severe cases, we
recommend
ThermaLLife
in combination with
MetaLLife
which is trademarked as
TooLLife
process.
Soldering of molten
metal, especially aluminum, is caused by the natural affinity of the metal
to the iron (Fe) in the die steel. There are two basic types of
soldering...mechanical and inter-metallic.
The first type,
mechanical, is simply the due to the loss of lubricant which allows the
aluminum to interact or wet the steel surface. This is the first stage
and easily controlled if caught early. When the loss of lubricant or a
protection barrier is prolonged, inter-metallic soldering is the next stage.
This type of soldering is no longer only aluminum sticking the die surface.
Compounds of aluminum and iron are formed...FeAl3, Al4FeSi,
Al15Fe5Si5, Al12Fe6Si5.
This type of soldering when removed also deteriorates and erodes some of the
die steel's iron when removed.
| Stage |
Description |
Cause |
| I |
Erosion of
grain boundaries |
Weak regions
- cavitation |
| II |
Pitting of
die surface |
Loose grain -
cavitation |
| III |
Formation of
iron-aluminum compounds |
Chemical -
electron imbalance |
| IV |
Formation of
pyramid shapes |
Rapid
diffusion of iron |
| V |
Adherence of
Aluminum |
Cracks in
surface at pyramids |
| VI |
Erosion pits |
Cavitation
loss of yield strength |
Related Topics
> -
Specifications |
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Resultant inter-metallic solder |
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