Abstract
Abstract In the paper has been discussed influence of stresses on general corrosion rate and corrosion pit nucleation rate and growth , whose presence has been questioned by some authors but accepted by most of them. Influence of roughness of pit walls on fatigue life of a plate suffering pit corrosion and presence of the so called „ non-damaging” pits which never lead to initiation of fatigue crack, has been presented. Possibility of prediction of pit-to-crack transition moment by two different ways, i.e. considering a pit a stress concentrator or an equivalent crack, has been analyzed. Also, influence of statistical distribution of depth of corrosion pits as well as anticorrosion protection on fatigue and corrosion fatigue has been described.
Highlights
Pitting corrosion constitutes the extreme form of material surface roughness due to corrosion
Melchers [1] has stated that influence of pitting corrosion on strength of well maintained structures such as ship ones is very low, but reduction of thickness due to general corrosion is much more important
On the basis of nine different tests, Akid et al [25] stated that the time to initiation of corrosion fatigue crack, i.e. the total time for nucleation and growth of a pit and its transformation into crack, was strongly decreasing along with cyclic stress increasing
Summary
Pitting corrosion constitutes the extreme form of material surface roughness due to corrosion.
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