A Study of Corrosion Films on Zirconium and Its Alloys by Impedance Measurements

Wanklyn, J.N.; Silvester, D. R.

doi:10.1149/1.2428684

Cited by 27 publications

(8 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5. The latter shows the reciprocal capacity, because this quantity is proportional to the "capacity thickness" of uncracked oxide (1,6). It was further found that, when specimens of Zircaloy 2 were corroded initially in high-pressure steam and then transferred to low pressure, their capacity values changed toward values characteristic of the new conditions, and a reverse effect was found ,,~/"/'" on transferring from low to high pressure.…”

Section: Resultsmentioning

confidence: 98%

See 1 more Smart Citation

Influence of Environment on the Corrosion of Zirconium and Its Alloys in High-Temperature Steam

Wanklyn

Britton

Silvester

et al. 1963

J. Electrochem. Soc.

Self Cite

View full text Add to dashboard Cite

Measurements of weight gains and film capacities of zirconium and zirconium alloys in steam and oxygen at atmospheric and high pressures are reported. At best, the behavior of resistant alloys and of Van Arkel zirconium in steam inhibited with boric acid is comparable to that of Van Arkel zirconium in oxygen. It is concluded that in steam, but not in oxygen, the pressure drop due to the flow of gas through porous oxide is a significant factor in the effects observed. Alloying elements, and also boric acid inhibition, decrease the film cracking or porosity which, with unalloyed zirconium, leads to very rapid corrosion in high-pressure steam. With some more resistant materials there appears to be a compensation effect whereby films formed in high-pressure steam are less porous than those formed at atmospheric pressure.Detailed topographical studies of the early stages of film growth and breakdown on Van Arkel zirconium in steam and in oxygen are described. In addition to uniform film growth, at rates varying with grain orientation, rapid localized attack is found in steam. Such attack is accelerated by an increase of pressure and appears to be diminished by additions of copper and by boric acid inhibition. This localized corrosion is considered to be due to the same type of film failure as is responsible for cracking or porosity in thicker, more uniform, films at a later stage of corrosion. The implications of the findings for the development of steam-resistant alloys are considered.Earlier publications have considered the influence of alloying elements on the corrosion of zirconium alloys (1) and the uptake of corrosion-produced hydrogen by alloys and by unalloyed zirconium (2). This paper describes attempts to elucidate the mechanisms of oxide film growth and breakdown by varying the corrosive environment. Most of the experiments were conducted at the same temperature, 500~and comparisons were made of behavior in steam and in dry oxygen, and of the influence of pressure in these two media. For some purposes experiments started in one condition and then transferred to another were found informative. Detailed topographical studies of the early stages of oxidation of unalloyed zirconium under various conditions were made to identify modes of film breakdown in the various media.

show abstract

Section: Resultsmentioning

confidence: 98%

“…Film capacity measurements to determine the degree of cracking or porosity were performed as de- scribed elsewhere (1,6). Anodic films were prepared on Van Arkel zirconium, and the relation between weight gain and color (or interference minima, measured on a spectrophotometer) were determined (4).…”

Section: Apparatus and Proceduresmentioning

confidence: 99%

Influence of Environment on the Corrosion of Zirconium and Its Alloys in High-Temperature Steam

Wanklyn

Britton

Silvester

et al. 1963

J. Electrochem. Soc.

Self Cite

View full text Add to dashboard Cite

show abstract

“…For films having thicknesses beyond the interference color range, Wanklyn (9) showed that the corrosion resistance of zirconium could be expressed by combining weight gain and capacitance data. He proposed the factor l/CW, where C is the capacitance in |if/cm and W is the weight gain in mg/cm .…”

Section: Spectrophotometric Examinationmentioning

confidence: 99%

Characteristics of Anodic and Corrosion Films on Zirconium

Misch¹

1960

View full text Add to dashboard Cite

“…Consequently, considerable effort is devoted to development of advanced cladding materials that exhibit both improved waterside corrosion resistance and resistance of internal surfaces to hydriding. Some studies have been done on the corrosion characteristics of prefilmed zirconium alloys [7][8][9]. However, no systematic study of zirconium alloys with a high temperature pre-formed oxide film has been performed.…”

Section: Introductionmentioning

confidence: 99%

Corrosion characteristics of zirconium alloy with a high temperature pre-formed oxide film

Hong

Yun

Lee

2005

Journal of Alloys and Compounds

View full text Add to dashboard Cite

A Study of Corrosion Films on Zirconium and Its Alloys by Impedance Measurements

Cited by 27 publications

References 1 publication

Influence of Environment on the Corrosion of Zirconium and Its Alloys in High-Temperature Steam

Influence of Environment on the Corrosion of Zirconium and Its Alloys in High-Temperature Steam

Characteristics of Anodic and Corrosion Films on Zirconium

Corrosion characteristics of zirconium alloy with a high temperature pre-formed oxide film

Contact Info

Product

Resources

About