Self-repairing oxides to protect zinc: Review, discussion and prospects

Thomas, Sebastian; Birbilis, Nick; Venkatraman, Murali Sankar; Cole, Ivan

doi:10.1016/j.corsci.2013.01.011

Cited by 121 publications

(80 citation statements)

References 98 publications

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“…39 The Cr 2 O 3 -based film also has a wide pH stability (between pH 2 and 12) and thus forms a protective insoluble barrier upon the metal. 46 Therefore, the Cr concentration must be >12 at.% in the case of Ni-Cr, Fe-Cr and Fe-Cr-Ni alloys for 'stainless' behaviour. 42 The Cr concentration in Cr-containing CCAs is typically higher than 12%, and it is therefore plausible that Cr-containing CCAs have corrosion resistance (akin to Fe-Cr-Ni and Ni-Cr alloys)-should the hitherto unknown threshold for stimulation of a chromium oxide passive film in CCAs be fulfilled.…”

Section: The Influence Of Different Alloying Elements On the Corrosiomentioning

confidence: 99%

Corrosion of high entropy alloys

Qiu¹,

Thomas²,

Gibson³

et al. 2017

npj Mater Degrad

398

133

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High entropy alloys represent a unique class of metal alloys, comprising nominally five or more elements in near equiatomic proportions. High entropy alloys have gained significant interest on the basis that the high configurational entropy of such alloy systems is purported to result in a single-phase solid solution structure. While such a single-phase structure can occur in unique systems, it is now appreciated that the definition of high entropy alloys can be broader, with systems comprising only four elements possible of forming single phases, and most five (or more) element systems actually being multi (>2) phases. To this end, the notion of compositionally complex alloys is a more general description, with the concise review herein focusing on the corrosion of compositionally complex alloys (inclusive of high entropy alloys). It is noted that generally, in spite of complex compositions and in many cases complicated microstructural heterogeneity, compositionally complex alloys are nominally corrosion-resistant. This is discussed and aspects of the status and needs are presented.

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Section: The Influence Of Different Alloying Elements On the Corrosiomentioning

confidence: 99%

Corrosion of high entropy alloys

Qiu¹,

Thomas²,

Gibson³

et al. 2017

npj Mater Degrad

398

133

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“…The corrosion inhibitor is a chemical substance that interacts with the metal surface by an adsorption process protecting metal surface by forming film [9,10]. Inhibitor retards the corrosion either by reducing the movement or diffusion of ions to the metal surface, or by increasing the electrical resistance of metallic surface [11].…”

Section: Resultsmentioning

confidence: 99%

“…The corrosion rate, the percentage of inhibition efficiency (IE %) and the degree of surface coverage (θ) of the investigated compounds was calculated from the following equations [9]. Where Δmfree and Δminh are the weight losses in the absence and presence of inhibitor, respectively.…”

Section: Weight Loss Measurementsmentioning

confidence: 99%

Corrosion Inhibition of Zinc Metal in 2M Hydrochloric Acid Solution by Using GuaifenesinDrug as an Inhibitor and Theoretical Calculations

Adil

2015

JNUS

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The inhibition of the corrosion of Zinc in 2 M HCl by guaifenesin has been investigated at room temperature using weight loss measurements. Results obtained showed that guaifenesin is a good inhibitor and its inhibition efficiency (IE %) increased with the increase of inhibitor concentration since it was 81%. At 300 ppm.The surface coverage was 0.81 at 300 ppm inhibitor concentration; hence the optimum concentration was 300 ppm.Theoretical calculations investigate by studying the relationship between molecular structure and inhibition efficiency by using semi-empirical molecular quantum calculations within the PM3 method as implemented in HyperChem package.

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“…Nonetheless, it has been proven that the phosphate-based film does not have the ability to self-heal nor does it have the wide pH stability characteristic of the Cr 2 O 3 film. 113 Phosphates therefore cannot serve as viable systems to replace hexavalent chromates.…”

mentioning

confidence: 99%

“…108,109 This is due to the fact phosphates such as Zn 3 (PO 4 ) 2 have a limited pH stability in aqueous solutions (ranging between pH 5 and 10), unlike Cr 2 O 3 which has a wider pH stability ranging from pH 2 to 12. 113 Interestingly, strontium phosphate (SrP)-based conversion coatings have been found to successfully impart corrosion resistance to active metals such as pure Mg. 111 A protective surface film was found to form upon pure Mg after about 3 min of exposure in the coating bath, with an inner magnesium oxide layer and an outer SrP layer. 111 Overall, phosphate-based surface layers may serve as a protective barrier upon metals under near neutral pH conditions.…”

mentioning

confidence: 99%

Chromate replacement: what does the future hold?

Gharbi

Thomas

Smith³

et al. 2018

npj Mater Degrad

185

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The ubiquitous use of chromium and its derivatives as corrosion preventative compounds accelerated rapidly after the second industrial revolution, with such compounds now integral to modern society. However, the detrimental impact of chromium compounds on the environment and human health has prompted the need to revisit the majority of current industrial corrosion protection measures. This review retraces the origins of chromium replacement motivations, introducing the various legislative actions aimed at diminishing the use of chromium compounds, and critically reviews alternative corrosion preventative technologies developed in the recent decades to now. The review, herein, is intended for a broad audience in order to provide a concise update to an increasingly timely issue.

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Self-repairing oxides to protect zinc: Review, discussion and prospects

Cited by 121 publications

References 98 publications

Corrosion of high entropy alloys

Corrosion of high entropy alloys

Corrosion Inhibition of Zinc Metal in 2M Hydrochloric Acid Solution by Using GuaifenesinDrug as an Inhibitor and Theoretical Calculations

Chromate replacement: what does the future hold?

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