Naslov
Microbial pitting corrosion of stainless steel weldments in fresh water systems

Autori
Juraga, Ivan ; Esih, Ivan ; Mijatović, Ivan ; Šimunović, Vinko ; Stojanović, Ivan

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

Izvornik
Progress by Corrosion Control / EFC - Freiburg : EFC, 2007

Skup
Eurocorr 2007

Mjesto i datum
Freiburg, Njemačka, 09.09.2007. - 13.09.2007

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
MIC; Stainless Steel Weldments; Fresh Water; Surface State

Sažetak
A case of severe pitting corrosion of stainless steel pipes in a facility for fresh water treatment has been analysed. The phenomenon resulted in system's failure by water leakage. It is proven that the failure was the consequence of microbially induced corrosion under nodules formed by settlement of microbes on circumferential weldments and on adjacent heat tint zones. Microbiological testing revealed the presence of iron and manganese oxidising bacteria in the nodules. The presence of sulphides in corrosion products was also established that points at the activity of sulphate reducing bacteria under larger nodules. Accordingly, the process of damaging of stainless steel pipes is a combination of aerobic and anaerobic microbially induced corrosion. It is possible to achieve essential reduction of liability of such corrosion by acid pickling of the interior of welded stainless steel pipes that proves strong effect of surface state on damaging process. On the contrary the influence of the type of stainless steel is not significant.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA