Effect of nitrate ions on the oxidation of iodide ions during the dissolution of γ-irradiated NaCl in aqueous binary mixture of iodide and nitrate

Kalkar, C. D.; Doshi, Siddharth

doi:10.1007/bf02164861

Cited by 5 publications

(1 citation statement)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is for this reason that high dosages of Ca(NO 3 ) 2 (10 mass %) enhance the oxidative dissolution of iron and compromise the corrosion inhibition effect that is offered by Ca(NO 3 ) 2 additions at lower concentrations. 50 As such, in closing this paper has comprehensively examined the corrosion of API P110 steel in concentrated halide environments in the presence of Ca(NO 3 ) 2 as a corrosion inhibitor. Special focus is placed on examining the evolution of corroding topographies-at unparalleled resolution-across a large field of view (FOV) using VSI for samples reacted in a controlled environment under isothermal conditions.…”

Section: Resultsmentioning

confidence: 99%

Steel corrosion inhibition by calcium nitrate in halide-enriched completion fluid environments

et al. 2018

View full text Add to dashboard Cite

Calcium nitrate (Ca(NO 3) 2) has been suggested to inhibit steel corrosion. However, the effectiveness of corrosion inhibition offered by calcium nitrate in highly halide-enriched environments, for example, completion fluids, is not well known. To better understand this, the inhibition of corrosion of API P110 steel by Ca(NO 3) 2 was studied using vertical scanning interferometry in solutions consisting of 10 mass % calcium chloride (CaCl 2) or 10 mass % calcium bromide (CaBr 2), for example, to simulate the contact of completion fluids with the steel sheath in downhole (oil and gas) applications. The evolution of the surface topography resulting from the initiation and growth of corrosion pits, and general corrosion was examined from the nano-scale to micron-scale using vertical scanning interferometry. Special focus was paid to quantify surface evolution in the presence of Ca(NO 3) 2. The results indicate that, at low concentrations (≈1 mass %), Ca(NO 3) 2 successfully inhibited steel corrosion in the presence of both CaCl 2 and CaBr 2. Statistical analysis of surface topography data reveals that such inhibition results from suppression of corrosion at fast corroding pitting sites. However, at higher concentrations, calcium nitrate's effectiveness as a corrosion inhibitor is far less substantial. These results provide a means to rationalize surface topography evolution against the electrochemical origin of corrosion inhibition by NO 3 − species, and provide guidance regarding the kinetics, and susceptibility to degradation of the steel sheath during exposure to halide-enriched completion fluids.

show abstract

Section: Resultsmentioning

confidence: 99%