Field exposure study under sheltered and open exposure conditions at different test sites in Germany: First‐year corrosion rate and atmospheric corrosivity

Abstract

The corrosivity of atmospheres in Europe has changed significantly in recent decades. For the Federal Republic of Germany, no current values for the corrosion rate based on 1-year atmospheric exposure of standard specimens can be found in the scientific literature after 2000. This paper presents results from a field exposure study in the Berlin metropolitan area and Helgoland in 2016. Based on standard specimens, values for the corrosion rate and the corresponding atmospheric corrosivity category are determined for open exposure and indirect weathering in a ventilated enclosure as sheltering after 1 year of exposure. The results prove that determined corrosivity categories are material-specific. Sheltered exposure is a typical atmospheric situation for many building components. It allows statements on the effect of the concentration of airborne substances on the corrosivity beyond the normative requirements.

Effect of Al and Ca Elements on the Atmospheric Corrosion of Field-Exposed Mg–Al–Zn–Ca–Mn Magnesium Alloys

“…However, in the case of copper, Al, and weathering steel, the trend is reversed when they are exposed to industrial or marine environments. 8,21 Studies discussing these exposure conditions in the atmospheric corrosion of Mg-Al alloys are scarce. [18][19][20] Liao and Hotta 18 compared the mass loss of AZ31B specimens under unsheltered and sheltered environments and found that the unsheltered specimens exhibited much higher mass loss.…”