CORROSION BEHAVIOUR OF SOME NONFERROUS METALS AND ALLOYS IN VIETNAM HUMID TROPICAL CLIMATE

Abstract

Corrosion behaviour of some nonferrous metals and alloys after 2 years exposure test in humid tropical conditions is informed. Data has been collected from 2 climate areas of Vietnam, including one urban (Hanoi) and two seashore (Nhatrang) materials testing sites. Corrosion products appearance and corrosion rate of copper, zinc and alluminium alloys are described. Severe corrosion degradation at Nhatrang seashore site is demonstrated. Comparative results for corrosion rate after two years exposure between Nhatrang and Hanoi sites are presented. These values at Nhatrang seashore are 16.6 - 21.3, 2.5-3.5 and 2.2 times higher for alluminium, copper and zinc alloys respectively. Strong influence of aerosol chlorides on corrosion rate is also demonstrated for two Nhatrang sites with different distances from coastline.