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Cathodic Reactions Involved in Corrosion Processes Occurring in Concentrated Nitric Acid at 100 °C
Author(s) -
Balbaud Fanny,
Sanchez Gérard,
Santarini Gérard,
Picard Gérard
Publication year - 2000
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(200004)2000:4<665::aid-ejic665>3.0.co;2-n
Subject(s) - chemistry , chronoamperometry , nitric acid , cyclic voltammetry , platinum , inorganic chemistry , electrochemistry , electrode , autocatalysis , reaction mechanism , rotating disk electrode , electrode potential , cathodic protection , corrosion , nitrous acid , voltammetry , catalysis , organic chemistry
In order to explain and analyze the corrosion process of AISI 304 L stainless steel in the presence of nitric acid condensates, the reduction mechanism of nitric acid was studied on a platinum electrode in various nitric acid solutions (4 mol · L −1 , 8 mol · L −1 and 12 mol · L −1 ) at 100 °C. Classical electrochemical techniques were used: cyclic voltammetry, chronoamperometry on a stationary electrode as well as on a rotating disk electrode. A reduction mechanism is proposed; this mechanism is autocatalytic and involves a charge‐transfer step and a heterogeneous chemical reaction which regenerates the electroactive species at the electrode surface. The electroactive species is assumed to be nitrous acid which is a soluble species. The other compounds involved in the reduction mechanism are NO and NO 2 , which are supposed to be adsorbed. The nitric acid concentration influences the major product of the reduction process: NO for concentrations lower than 8 mol · L −1 and NO 2 for higher concentrations.