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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.
