Effects of organic acid pickling on the corrosion resistance of magnesium alloy AZ31 sheet

Nwaogu, Ugochukwu Chibuzoh; Blawert, Carsten; Scharnagl, Nico; Dietzel, W.; Kainer, Karl Ulrich

doi:10.1016/j.corsci.2010.03.002

Cited by 71 publications

(37 citation statements)

References 19 publications

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“…[21][22][23] There are mainly two types of preferred pretreatments for Mg alloy, including zinc immersion and direct ENP.…”

Section: -12mentioning

confidence: 99%

“…[17][18][19][20] Therefore, appropriate pretreatment steps must be taken before ENP to remove the natural oxide tarnish, embedded sand, heavy metal impurities and burned-in lubricants on the surface of the Mg alloy, and to activate the deposition of nickel on the matrix. [21][22][23] There are mainly two types of preferred pretreatments for Mg alloy, including zinc immersion and direct ENP. 18,24 The direct ENP is simpler and more convenient.…”

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confidence: 99%

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Studies of Several Pickling and Activation Processes for Electroless Ni-P Plating on AZ31 Magnesium Alloy

Xie

Chen

Xiang

et al. 2014

J. Electrochem. Soc.

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Several chromium-free pickling and activation processes were investigated in order to develop an eco-friendly pretreatment for electroless Ni-P plating on magnesium alloy. The coatings obtained from etching only in H 3 PO 4 solution exhibit poor adhesion due to the existance of an interlayer. Meanwhile, a corrosion model of Mg alloy in H 3 PO 4 solution was proposed. When fluoride was added into the pickling solution, the adhesion of the coatings was also unsatisfied because of the bad mechanical interlocking action. By comparison, the coatings obtained from pickling in H 3 PO 4 solution followed by NH 4 Magnesium (Mg) alloy is one of the lightest structural metals and a potential candidate to replace the heavier aluminum or steel in manufacturing of mechanic components due to its low density, excellent physical and mechanical properties. [1][2][3][4][5][6] However, the use of Mg alloy for structural applications has been limited owing to their poor corrosion resistance and high chemical reactivity. 7-12Electroless Ni-P plating (ENP) is one of the most effective surface treatment techniques to overcome the defect of Mg alloy, because ENP can provide excellent properties of hardness, good wear resistance and great corrosion resistance by forming a uniform deposit on the Mg alloy substrate surface. [13][14][15][16] However, ENP on Mg alloy presents many problems still because of the rapid formation of oxide film upon Mg alloy exposed to air/water, and forming loose immersion layers on the substrate surface by replacement reactions at the initial deposition stage. The loose oxide film and immersion layers hinder successful ENP and are detrimental to the adhesion and uniformity of subsequent coatings.17-20 Therefore, appropriate pretreatment steps must be taken before ENP to remove the natural oxide tarnish, embedded sand, heavy metal impurities and burned-in lubricants on the surface of the Mg alloy, and to activate the deposition of nickel on the matrix. [21][22][23] There are mainly two types of preferred pretreatments for Mg alloy, including zinc immersion and direct ENP.18,24 The direct ENP is simpler and more convenient.11 However, acid pickling in a chromiumcontaining (VI) solution, followed by activation in a hydrofluoric acid solution is usually employed in the conventional pretreatment processes of direct ENP. [25][26][27][28][29][30] Several modified pretreatments have been devised to avoid the use of such process, which contains some species detrimental to the environment and harmful to human health. 11,[31][32][33] A method of avoiding the use of toxicant was carried out by employing a pre-plating step with an alkaline ENP bath prior to subsequent common ENP in an acidic bath.31 Molybdate (MoO 4 2− ) chemical conversion coating was also attempted for replacing the chromium acid pickling. [32][33] In the work of Ref. 32, strong volatile hydrogen fluoride acid was applied in the activation process and the molybdate conversion bath contained carcinogenic NaNO 2 . 32 The adhesion, which is a very important...

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“…[21][22][23] There are mainly two types of preferred pretreatments for Mg alloy, including zinc immersion and direct ENP.…”

Section: -12mentioning

confidence: 99%

mentioning

confidence: 99%

Studies of Several Pickling and Activation Processes for Electroless Ni-P Plating on AZ31 Magnesium Alloy

Xie

Chen

Xiang

et al. 2014

J. Electrochem. Soc.

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“…However, since Mg alloys are electrochemically too active to be used without surface treatment in corrosive environments, their practical applications have been limited. Thus, many scientists have tried to develop surface treatment methods to improve corrosion resistance of Mg alloys [1][2][3][4][5][6][7][8][9] . For the surface treatment of Mg alloys, one of the most important and difficult steps is a pretreatment process by which clean and well-defined surface should be obtained.…”

Section: Introductionmentioning

confidence: 99%

A Blade-Abrading Method for Surface Pretreatment of Mg Alloys

Moon¹

2015

Journal of the Korean institute of surface engineering

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A blade-abrading method was newly developed for the preparation of clean Mg alloy surface and reported for the first time in detail in this paper. The blade-abrading method includes abrading of the Mg alloy surface with a sharp blade or knife to remove the surface oxide and contaminants on the skin of Mg alloys mechanically, thereby providing very clean surface of Mg alloys. The clean surface prepared by the blade-abrading method in the air was found to be covered with thin and dense air-formed oxide films. Based on the experimental results obtained in this work, it is concluded that the newly developed blade-abrading technique is a very simple and useful pretreatment method which can provide clean and well-defined surface for the following surface treatments.

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“…Mild steel are the most commonly used construction materials due to its low cost, strength and ease of fabrication but they are affected greatly by its high corrosion rate caused by aggressive acids 1 . Mineral acids solutions especially, Hydrochloric and sulfuric acids are often used for pickling 2,3 , cleaning 4 , descaling 5 , and oil-well acidization 6 . On the contrary, they cause pitting which results in structural weakness and disintegration of the metal.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Corrosion Inhibition of Vitamins B1 and C on Mild Steel in 0.5 M HCl Solution: Experimental and Computational Approach

Ahmed¹

2016

Orient. J. Chem

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Corrosion inhibition behavior of Ascorbic acid (AA) vitamin C and Thiamine (Th) vitamin B1 on mild steel corrosion in 0.5 M HCl was investigated at various immersion times. The electrochemical characteristics of mild steel in absence and presence of the inhibitors were verified by the cyclic voltammetry method. The protective properties of the passive film were acquired by electrochemical impedance spectroscopy. The best inhibitive performance was obtained for VitB1. The polarization curves indicated the high inhibition efficiency of the inhibitors. The existence of a protective film on mild steel was confirmed by SEM techniques. Computational chemistry was carried out to establish the mechanism of corrosion inhibition.

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Effects of organic acid pickling on the corrosion resistance of magnesium alloy AZ31 sheet

Cited by 71 publications

References 19 publications

Studies of Several Pickling and Activation Processes for Electroless Ni-P Plating on AZ31 Magnesium Alloy

Studies of Several Pickling and Activation Processes for Electroless Ni-P Plating on AZ31 Magnesium Alloy

A Blade-Abrading Method for Surface Pretreatment of Mg Alloys

Investigation of Corrosion Inhibition of Vitamins B1 and C on Mild Steel in 0.5 M HCl Solution: Experimental and Computational Approach

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