Effect of heat treatment on the Inhibition of the acidic corrosion of aluminum alloy

✍ Scribed by Dr. E. Khamis; M. El-Gamal; A. El-Toukhy; M. Atea

• Publisher: John Wiley and Sons
• Year: 1994
• Tongue: English
• Weight: 576 KB
• Volume: 25
• Category: Article
• ISSN: 0933-5137
• DOI: 10.1002/mawe.19940251208

✦ Synopsis

Abstract

The effect of heat treatment on the inhibition of acid corrosion of duralumin has been studied using gasometry, mass loss measurements and potentiodynamic technique. All the data reveal that the duralumin generally developed good corrosion resistance after heat treatment and the corrosion rate ranked as follows: Non treated > Naturally aged > quenched. This improvement in the corrosion resistance was attributed to the structural homogeneity of the heat‐treated alloys. The presence of some selected aryl and alkyl triazoline derivatives at the thershold concentration of 5 × 10^−3^ M indicate that these compounds retard the corrosion rate of duralumin and the extend of inhibition depends on the molecular structure of the inhibitors. Polarization curves show that the triazoline compounds act as mixed‐type inhibitors affecting both the cathodic and anodic process. Moreover, there is no noticeable difference in the degree by which the triazoline derivatives inhibit the corrosion of pure aluminium and heat treated duralumin alloy.