Aluminized steel is steel that has been hot-dip coated on both sides with aluminium–silicon alloy. This process assures a tight metallurgical bond between the steel sheet and its aluminium coating, producing a material with a unique combination of properties possessed neither by steel nor by aluminium alone. Aluminized steel shows a better behavior against corrosion[1]
Corrugated pipe is fabricated from steel that has been hot-dipped in commercially pure aluminum. Over 50 years of field-testing confirm that Aluminized Steel Type 2 (ALT2) corrugated steel pipe offers 75 years or more of maintenance free service life in the environmental ranges of pH 5-9 with resistivities as low as 1,500 ohm-cm.
References:
http://www.conteches.com/Products/Pipe/Corrugated-Metal-CMP/CMP-Coatings
