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Titolo:
THE EFFECT OF SALT CONCENTRATION ON NICKEL CORROSION BEHAVIOR IN SLIGHTLY ALKALINE-SOLUTIONS AT DIFFERENT HYDROSTATIC PRESSURES
Autore:
BECCARIA AM; POGGI G; ARFELLI M; MATTOGNO G;
Indirizzi:
CNR,IST CORROS MARINA MET,VIA SCARSELLINI 10 I-16149 GENOA ITALY CNR,IST TEORIA & STRUTT ELETTR I-00016 ROME ITALY
Titolo Testata:
Corrosion science
fascicolo: 6, volume: 34, anno: 1993,
pagine: 989 - 1005
SICI:
0010-938X(1993)34:6<989:TEOSCO>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
PASSIVE OXIDE-FILMS; ALUMINUM CORROSION; SULFATE-SOLUTIONS; AQUEOUS-SOLUTIONS; ANODIC-OXIDATION; CHLORIDE-ION; ELECTRODES; MECHANISM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
A.M. Beccaria et al., "THE EFFECT OF SALT CONCENTRATION ON NICKEL CORROSION BEHAVIOR IN SLIGHTLY ALKALINE-SOLUTIONS AT DIFFERENT HYDROSTATIC PRESSURES", Corrosion science, 34(6), 1993, pp. 989-1005

Abstract

The hydrostatic pressure effect on nickel corrosion in NaCl solutions(from 5.8 x 10(-2) to 1.2 mol l-1 and in Na2SO4 solutions (from 10(-2) to 10(-1) mol l-1) was investigated with electrochemical and XPS techniques. By increasing the pressure, the average nickel corrosion ratedecreases in dilute NaCl and Na2SO4 solutions, whereas it increases in concentrated solutions. This was explained by the different nature of corrosion layers formed in these solutions. Since the percentage of wet nickel oxides decreases by increasing the hydrostatic pressure: (1) in dilute solutions, with insignificant Cl- (or low SO42-) in the corrosion products, the nickel corrosion resistance increases by increasing the pressure; (2) in concentrated solutions, with a greater amountof Cl- or SO4- ions in the corrosion products, by decreasing the pressure, the corrosion resistance decreases. This is likely to be due to the formation of wet oxides at 1 atm of a steric hindrance which inhibits further SO42- or Cl- chemisorption.

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Documento generato il 29/11/20 alle ore 10:25:26