1989
DOI: 10.1520/jte11142j
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Monitoring Environmental Tests by Coulometric Reduction of Metallic Control Samples

Abstract: This paper describes a standard procedure for using constant-current electrolytic reduction (“coulometric reduction”) to determine the relative buildup of corrosion and tarnish films on control coupons from environmental tests, and discusses the types of results and correlations that may be expected. Examples of the applications of this proposed ASTM standard method will be presented for two types of environmental exposure: the mixed flowing gas test and the humid sulfur vapor (“flowers-of-sulfur”) test.

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Cited by 38 publications
(4 citation statements)
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“…The length of each plateau is determined by local minima of the derivative of the reduction curve. 27 Although no paratacamite was detected by XRD for samples exposed less than 15 h, the reduction charge above the cuprite reduction plateau can still be assigned to Qp, since it was due to reduction of Cu 2+ ions. Besides the calculation of total Cu weight loss, the weight loss due to formation of cuprite or paratacamite can be calculated separately with equations 3 and 4, respectively:…”
Section: Identification and Quantification Of Corrosion Products-tablementioning
confidence: 96%
“…The length of each plateau is determined by local minima of the derivative of the reduction curve. 27 Although no paratacamite was detected by XRD for samples exposed less than 15 h, the reduction charge above the cuprite reduction plateau can still be assigned to Qp, since it was due to reduction of Cu 2+ ions. Besides the calculation of total Cu weight loss, the weight loss due to formation of cuprite or paratacamite can be calculated separately with equations 3 and 4, respectively:…”
Section: Identification and Quantification Of Corrosion Products-tablementioning
confidence: 96%
“…Electrolytic cathodic reduction , was used to determine the composition and film thicknesses of colored products on the Ag electrode surface of the Ag/C sensor. A standard three-electrode cell containing deaerated 0.1 M KCl as the electrolyte, a Pt mesh counter electrode, a saturated calomel reference electrode, and the specimen as the working electrode was used.…”
Section: Methodsmentioning
confidence: 99%
“…The time required for the reduction of the colored products on the Ag electrode, t red (s), was read from the obtained potential–time curve. Using Faraday’s law, the average film thickness of a substance being reduced, t (nm), is defined in eq as follows: , t ( nm ) = M i t red / ( n F ρ ) × 10 where M is the molecular weight (g/mol), i is the electrolytic current density (−39 μA/cm 2 ), n is the number of electrons required for the reduction reaction, F is the Faraday constant (96,480 C/mol), and ρ is the density (g/cm 3 ).…”
Section: Methodsmentioning
confidence: 99%
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