Naslov
Pitting liability testing and the risk of technical failures

Autori
Esih, Ivan ; Alar, Vesna ; Rajhenbah, Darko

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the Eurocorr 2006 / - Maastricht : The Nederlands Corrosion Center, 2006

Skup
Eurocorr 2006

Mjesto i datum
Maastricht, Nizozemska, 25.09.2006. - 28.09.2006

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
pitting corrosion; stainless steels; falure risk; pitting liability

Sažetak
The relation between pitting liability determined by laboratory testing and the risk of failures in technical systems is analysed. Many technical failures are caused by pitting corrosion of structural metals (especially of stainless steels, nickel alloys, aluminum and its alloys). Such failures manifest themselves mostly as perforations of thin-walled structures (pipes, vessels and other hollow objects) or as cracks and fractures at the bottom of pits on structures under stress. On the other hand, pitting liability is usually estimated on the basis of tests concerning the behaviour of specimens exposed to a particular electrolyte. If pitting appears the number of pits (np), their depths (hp) and size (orifice areas, Sp) are determined. For the evaluation of pitting failure risk important quantities are:  maximum pit depth (hmax) and  pits density ie number of pits per unit area (np/S). The greater value of hmax corresponds to the shorter time before the first failure. The increase of np/S provokes the probability of frequent subsequent failures. The reliability of failures forecasts is also discussed.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA