Effect of service conditions on corrosion performance of alloy CN 108 tubes in MSF desalinators

Autor:	Gualtiero Gusmano, Enrico Traversa, C. Simoncelli, R. Cigna
Rok vydání:	1990
Předmět:	Corrosion potential Materials science Metallurgy Alloy Oxide chemistry.chemical_element engineering.material Condensed Matter Physics Corrosion chemistry.chemical_compound Residual chlorine chemistry polycyclic compounds Chlorine Pitting corrosion engineering General Materials Science
Zdroj:	Materials Chemistry and Physics. 24:457-471
ISSN:	0254-0584
DOI:	10.1016/0254-0584(90)90134-v
Popis:	Results of tests performed on CN 108 alloy tubes in a desalinator and in a test loop, showed that the main corrosion cause has to be ascribed to incorrect service conditions. Both high chlorination and no chlorination cause a rapid increase of the alloy corrosion potential from the first days and pitting initiation of tube samples with different superficial finish (as received and pickled). Moderate chlorine dosage (free residual chlorine ≤ 0.5 ppm) is effective to avoid that rapid increase of Ecorr and pitting initiation. The presence of a thermal Mn-rich oxide film is not harmful by itself; however, in concurrence with incorrect service conditions it can contribute to the pitting corrosion initiation.
Databáze:	OpenAIRE
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