SR325 Update of New Zealand's atmospheric corrosivity map: Part 2 (2015)

This study is the second part of the research project that aims to check and maintain the ongoing validity New Zealand atmospheric corrosion rate dataset. This dataset underpins the New Zealand atmospheric corrosivity map.

The first-year atmospheric corrosion rates of mild steel and hot-dip galvanised (zinc) steel samples were measured at another 25 sites selected mainly in Auckland, Wellington and Christchurch. Analysis supports the conclusion drawn in the first part of this research, i.e. at most testing sites, the newly derived atmospheric corrosion data is comparable with the old data. Thus, a combination of the data collected by BRANZ in different periods (1987-1988, 2011-2012 and 2013-2014) will make the atmospheric corrosion rate dataset more complete and useful.