ALMAX | Metal Surface Modification | Products

ALMAX®

ALMAX® treatment is the surface modification method that diffuses aluminum (Al) into a metal surface to form an aluminum nitride layer (Fe-Al-N layer) with high Al concentration.

This Fe-Al-N layer has the characteristic of high anti exfoliate even to cycled rapid heating and cooling.

Furthermore, this Fe-Al-N layer is selectively oxidized and the coating film of Al₂O₃ is formed on the outermost surface at a high temperature atmosphere, and this coating film has the excellent effect to free from seizure and galling of bolts and nuts.

Characteristics of ALMAX®

Benefits

Seizure resistance
High-temperature oxidation resistance
Carburization resistance
Nitridization resistance
Resistance to spatter sticking
Corrosion resistance

Photograph of cross-sectional microstructure after ALMAX^® treatment (Left：SS400 , Right：SUS304)

Application

Bolts, nuts, and metal fixtures used in furnaces and other equipment

	Standard part	ALMAX®
Before heating	tightened by torgue of 12.4N・m	tightened by torgue of 12.4N・m
800℃ × 3 Hr. After heating	Cannot be removed due to seize-up.	*Values indicate maximum torque when loosening

Comparison of amount of oxidation