Long Lasting Time Outdoor Atmospheric
Corrosion Tests
Author(s)
M. Leiro & E. S. Ayllón
Abstract
Since its introduction in 1933, the concept of patinas as a corrosion controlling
mechanism has been playing an important role in many structural applications.
The analysis of the initial stages of the corrosive attack showed that this
phenomenon, which was considered uniform at first, is actually a moderate one
being the non-metallic inclusions in structural steels, the preferred points of
attack.
Long-lasting tests were carried out in the urban site of Villa Martelli-
Argentina outdoor tests station. Specimens were obtained from a hot-rolled
structural steel sample of 3.5 mm thickness, 45 mm wide and 300 mm long. The
outdoor tests were carried out over 35 years. The results were obtained by
optical microscopy, electron scanning, and electron probe microanalysis showing
that the addition of microalloyed elements modifies steel behaviour. This
modification means a steel increase resistance towards atmospheric corrosion.
1 Introduction
The term ‘weathering steels’ describes a class of low-alloy structural steels that
develop an adherent protective rust layer, called patina, during exposure to the
atmosphere As a result of this, weathering steels, unlike ordinary plain carbon
steels, do not require painting, which means important advantages: avoiding
associated costs of initial painting, periodic repainting, containment and disposal
of blasting debris during repainting.
Keywords
Related Book
Other papers in this volume
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