Effect of manganese content in Al-Mn alloys on pitting factor

Abstract

The occurence of pitting attacks in Al-Mn alloys were investigated by using "pitting factor". The pitting factor for the Al-Mn alloys galvanic-coupled with pure iron in deaerated 0.1M NaCl solution decreased with increasing manganese content in Al-Mn alloys. The pitting factor was smaller than 1 when the manganese content in Al-Mn alloy was higher than 1.62%. This leads to the no-occurence of pitting attacks for aluminum.