Influence of phytic acid concentration on coating properties obtained by MAO treatment on magnesium alloys

Zhang, R.F.; Zhang, S.F.; Duo, Shuwang

doi:10.1016/j.apsusc.2009.04.145

Cited by 87 publications

(24 citation statements)

References 18 publications

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“…R.F. Zhang et al [66] studied the effect of PhA at C ≤ 12 g/l in a solution containing 10 g/l NaOH on the regime of microarc oxidation of the AZ91HP alloy (mass%: 8.93 Al, 0.47 Zn, 0.22 Mn, 0.03 Si, 0.002 Cu, 0.001 Ni, 0.001 Fe). They studied the composition and morphology of the CC formed using EDRS and SEM, and its protective properties were estimated from the results of polarization measurements on the oxidized alloy in 3.5% NaCl.…”

Section: Organic Esters Of Phosphoric Acidmentioning

confidence: 99%

Organic corrosion inhibitors: where are we now? A review. Part III. Passivation and the role of the chemical structure of organophosphates

2017

Int. J. Corros. Scale Inhib.

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This article continues the review of studies (2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016) dealing with the passivation of various metals by solutions of organic corrosion inhibitors. It provides an overview of papers on the passivating properties of organophosphates, their complexes and salts. The results of corrosion and electrochemical studies, as well as studies on the composition and structural features of surface layers on metals by a variety of physicochemical methods are considered. Organic phosphorus compounds are often called organophosphates, especially in the case of pesticides and even toxic agents. Of course, it is unlikely that such materials have application prospects for the inhibition of metal corrosion. That is why in this series of reviews we consider organophosphates in a narrower sense limited to phosphoric acid esters and their salts, as well as phosphonic acids, their salts or complex compounds with metal cations [1][2][3][4]. The easy synthesis of acid esters of phosphoric acid, the stability of mono-and disubstituted ester anions, their ability to form complexes and hydrophobic passive films on oxidized metal surfaces has been known for a long time [1]. They can be used for the passivation of phosphated metal surfaces, and their salts with amines are used within deicing formulations. These salts can inhibit not only corrosion but also formation of deposits, so they are used in two-phase systems in the oil industry. Since higher homologues are more effective, the solubility of alkylphosphonic acids is commonly increased by ethoxylation. Salts of these acids are used in cooling lubricants, e.g., waterbased cutting fluids. The low toxicity, ability to be chemisorbed on a metal surface, and some useful technological properties of acid esters of phosphoric acid continue to motivate researchers to look for effective corrosion inhibitors of various metals among these compounds and to study their protection mechanisms [5][6][7][8][9][10][11][12][13][14]. Key words: metal corrosion, inhibitors, metal passivation, organophosphates.

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Section: Organic Esters Of Phosphoric Acidmentioning

confidence: 99%

Organic corrosion inhibitors: where are we now? A review. Part III. Passivation and the role of the chemical structure of organophosphates

2017

Int. J. Corros. Scale Inhib.

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“…3c). In the light of our previous work under the same MAO conditions as used in the paper, where we found that anodic coatings could not be developed in a solution only containing NaOH [21], it is concluded that 8-HQ can take part in the coating formation and change the coating color.…”

Section: Effects Of 8-hq On Coating Formationmentioning

confidence: 81%

“…Due to the health and environmental pressure, some environmentally friendly processes have been developed in alkaline solutions mainly containing inorganic electrolytes such as silicate [1,[4][5][6][7][8][9][10][11][12][13][14][15][16][17], aluminate [2,5,6] and borate [4,5,7,11,15,18]. At present, some organic additives, for example, triethanolamine [4], glycerol [9,10,12], benzotriazole [11], surfactants [12], ethylene glycol [13,14], citrate [15,18,19], sodium acetate [20] and phytic acid [21] have been used in MAO on magnesium alloys. 8-Hydroxyquinoline (8-HQ), one of the nitrogen-heterocyclic aromatic hydrocarbons with moderate toxicity in rats (oral LD50 1200 mg/kg) [22], is widely used in many areas.…”

Section: Introductionmentioning

confidence: 99%

Influence of 8-hydroxyquinoline on properties of anodic coatings obtained by micro arc oxidation on AZ91 magnesium alloys

Zhang

Yang

et al. 2012

Journal of Alloys and Compounds

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“…Meanwhile, Zhang et al . 26,27 prepared PEO coatings on AZ91 HP in an electrolyte containing phytic acid (C 6 H 18 O 24 P 6 ) and reported that the addition of phytic acid into base solution aids the formation of the coating and that the coatings exhibit the best uniformity and corrosion protection. However, organic components containing several heteroatoms (i.e., nitrogen, oxygen, and sulfur) could hinder the corrosion of metals by interacting with the coating surface via chemisorption through electron cloud of the electron-donating groups of the molecules 25 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced Corrosion Protection Performance by Organic-Inorganic Materials Containing Thiocarbonyl Compounds

Zoubi

2018

Sci Rep

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In the present study, the synergistic effect on the corrosion protection properties of Mg alloys subjected to plasma electrolytic oxidation and chemically treated with thiourea as an inhibitor is investigated by surface microstructure analysis, evaluation of the electrochemical performance, and chemical quantum calculations. Physical adsorption of thiourea on the inorganic material surface might be due to physical interaction between thiourea with a low ionization potential serving as an electron donor and the inorganic components with high electron affinities acting as acceptors. The results from potentiodynamic polarization and electrochemical impedance spectroscopy for organic-inorganic coating reveal a clear decrease in the corrosion rate owing to the introduced thiourea.

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Influence of phytic acid concentration on coating properties obtained by MAO treatment on magnesium alloys

Cited by 87 publications

References 18 publications

Organic corrosion inhibitors: where are we now? A review. Part III. Passivation and the role of the chemical structure of organophosphates

Organic corrosion inhibitors: where are we now? A review. Part III. Passivation and the role of the chemical structure of organophosphates

Influence of 8-hydroxyquinoline on properties of anodic coatings obtained by micro arc oxidation on AZ91 magnesium alloys

Enhanced Corrosion Protection Performance by Organic-Inorganic Materials Containing Thiocarbonyl Compounds

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