What causes soldering in die casting dies and using ferritic nitrocarburized coatings

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Macro Photo of thick coating showing cracking of the compound layer after cyclical thermal fatigue of base H13 material.

Thick and Thin

Ferritic nitrocarburizing improves the resistance of H13 pins to soldering (sticking of aluminum) but does not totally prevent it.

Ferrritic nitrocarburizing improves significantly the resistance of H13 pins to washout (loss of base metal) of material.

Thick ferritic nitrocarburized diffusion layers provide better resistance to washout, however, tend to crack, chip or give the appearance of peeling or flaking. This is most likely seen in thicker rather than thinner diffusion compound layers.

Based on these tests and field observations, thick nitrocarburized coatings are not advisable for "solder intensive" applications or thermal fatigue protection.

Thin ferritic nitrocarburized coatings are more mallable to tolerate thermal fatigue situations than thicker diffusion layers.

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