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phosphating process for magnesium alloy

Phosphating process of AZ31 magnesium alloy and

2006-10-1  Zinc phosphate films were formed on AZ31 magnesium alloy by immersing into a phosphatation bath to enhance the corrosion resistance of AZ31. Different films were prepared by changing the processing parameters such as immersing time and temperature. The corrosion protection of the coatings was studied by electrochemical measurements such as

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Phosphating process of AZ31 magnesium alloy and

Abstract Zinc phosphate films were formed on AZ31 magnesium alloy by immersing into a phosphatation bath to enhance the corrosion resistance of AZ31. Different films were prepared by changing the processing parameters such as immersing time and temperature.

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Phosphate treatment of magnesium alloy implants for

2015-1-1  Normally, a phosphating treatment is a kind of conversion coating technology, during which a substance, magnesium alloy here, is immersed in a phosphating bath that contains several phosphates and other additives if necessary.

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Phosphate chemical conversion coatings for

2020-4-3  Chemical reactions of phosphate chemical conversion coatings. PCC coatings on Mg alloys involve several stages, i.e., cleaning, degreasing, pickling, phosphating, and sealing. The general sequence of the steps involved in the phosphating process is schematically presented in Fig. 1. Fig. 1.

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Phosphate coatings on magnesium alloy AM60 part 1:

2004-7-1  Open circuit potential (OCP) The formation of the phosphate layers was studied by following the open circuit potential (OCP) of the AM60 magnesium alloy in the three baths as a function of time. In Fig. 1, the OCP is shown as a function of time for the AM60 samples immersed in

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The Study of a Phosphate Conversion Coating on

2015-2-26  The growth process of the phosphate conversion coating on magnesium alloy AZ91D could be divided into three steps. In the first step (0-40 s) the potential fluctuated sharply due to the alternate presence and absence of the metastable crystal nucleuses and the formation of the stable crystal nucleuses. In the second step (40-200 s) the potential moved to the negative direction because of the electrochemical inhomogeneity attributed to the growth of the stable crystal nucleuses. In the finally step (200-1200 s) the potential move to the positive direction slowly until it leveled off because the thickness of the phosphate conversion coating increased gradually from the slab-like phosphate

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The Study of a Phosphate Conversion Coating on

2015-9-6  phosphate conversion coating on magnesium alloy AZ91D surface. The presence of ethanolamine in phosphating bath refined the microstructure of phosphate crystal layer, and the phosphate conversion coating formed at the optimum ethanolamine content of 1.2 g/L showed the most uniform and compact

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Preparation and Phosphating of Yttrium-Based Chemical

2016-11-13  the surface of the alloy, and dried in a stream of air. The yttrium-based conversion coating was prepared by immersing the AZ91D magnesium alloy sample in the solution containing 10 g/L yttrium nitrate at 30 ℃ for 50 min. Then the yttrium conversion coating was phosphated under the parameters shown in Table 1. Table 1.

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DISCUSSION ABOUT MAGNESIUM PHOSPHATING

Magnesium phosphating of magnesium alloys In 2009, the first paper about possible application of magnesium phosphate coating on magnesium alloy AZ31 was published [7]. The reason for specifying completely new phosphating bath is the effort to create completely unique coating with extraordinary corrosion resistance on magnesium alloys [7].

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Enhanced corrosion performance of magnesium

2017-5-1  Magnesium phosphate conversion coating (MPCC) was fabricated on AZ31 magnesium alloy for corrosion protection by immersion treatment in a simple MPCC solution containing Mg 2+ and PO 3−4 ions. The MPCC on AZ31 Mg alloy showed micro-cracks structure and a uniform thickness with the thickness of about 2.5 µm after 20 min of phosphating treatment.

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Study on Phosphating on the Magnesium Alloys

In this paper, the solution mainly containing Zn(H2PO4)2 was used to prepare phosphating coatings on AZ31,AZ61 and AZ91 magnesium alloys. The effects of the phosphating parameters and the composition of phosphating solution on the formation of the coatings were investigated by orthogonal tests. The corrosion behaviors of the phosphating coatings were also studied and it is found that there was

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The Study of a Phosphate Conversion Coating on

2015-2-26  The surface composition of the magnesium alloy samples was analyzed with a 2500VB2+PC XRD (Japan) and an ESCALAB-250 XPS (USA). 3. RESULTS AND DISCISSION 3.1 Potential-time curve test The potential of magnesium alloy AZ91D immersed in the phosphating bath at 45 ℃ was recorded with time, as showed in Fig. 1.

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DISCUSSION ABOUT MAGNESIUM PHOSPHATING

Magnesium phosphating of magnesium alloys In 2009, the first paper about possible application of magnesium phosphate coating on magnesium alloy AZ31 was published [7]. The reason for specifying completely new phosphating bath is the effort to create completely unique coating with extraordinary corrosion resistance on magnesium alloys [7].

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Zinc phosphate conversion coatings on magnesium

Phosphating is one of the most widely used surface treatments of steels and aluminum due to its low-cost, easy mass production, good corrosion resistance and good adhesion with paint. Many researchers have tried to expand applications of the phosphating process, especially to magnesium alloys for automobiles and aerospace applications. Recently, the coatings on magnesium alloys by zinc

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Magnesium alloy phosphating liquid,Environmental

2019-4-1  2. Immerse the oil-free magnesium alloy in the working liquid of phosphating agent at room temperature for 3-5 minutes, and flip the workpiece in the process to change the position of the workpiece. 3. Wash with water for 3 times 4. Dehydrate and dry the

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US20090159158A1 Phosphating solution and

An exemplary phosphating solution is used for conversion treating a surface of a magnesium alloy workpiece. The phosphating solution includes: 2.89 gram/liter to 8.67 gram/liter of phosphoric acid, 0.3 gram/liter to 1.0 gram/liter of carbamide, 0.39 gram/liter to 1.56 gram/liter of nitric acid, 6 gram/liter to 30 gram/liter of manganese dihydrogen phosphate, and 0.2 gram/liter to 0.6 gram

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Microwave-assisted magnesium phosphate coating

2017-8-18  This paper reports for the first time the use of a novel microwave-assisted coating process to deposit magnesium phosphate (MgP) coatings on the Mg alloy AZ31 and improve its in vitro corrosion resistance. Newberyite and trimagnesium phosphate hydrate (TMP) layers with distinct features were fabricated at various processing times and temperatures.

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Enhanced corrosion performance of magnesium

2017-6-5  on AZ31 Mg alloy. The corrosion current of MPCC was reduced to about 3% of that of the uncoated surface and the time for the deterioration process during immersion in 0.5 mol/L NaCl solution improved from about 10 min to about 24 h. Key words: magnesium alloy; AZ31 alloy; magnesium phosphate; conversion coating; corrosion protection 1 Introduction

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CN103526265A Surface treatment process for

The invention discloses a surface treatment process for a magnesium alloy. The process comprises the steps as follows: a), oil fouling on the surface of a magnesium alloy workpiece is removed; b), oxide on the surface of the magnesium alloy workpiece is removed; c), the magnesium alloy workpiece is subjected to phosphating in a phosphating solution, wherein the formula of the phosphating

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Automatic Corrosion Treatment of Magnesium

The technological process is as adhesion and corrosion resistance of phosphating film follows: 600#-800# abrasive paper grinding → and coating; the other is excessive pickling, resulting in washing → acetone ultrasonic cleaning → washing → the surface corrosion of magnesium alloy and rough degreasing → washing → pickling → washing

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DISCUSSION ABOUT MAGNESIUM PHOSPHATING

Magnesium phosphating of magnesium alloys In 2009, the first paper about possible application of magnesium phosphate coating on magnesium alloy AZ31 was published [7]. The reason for specifying completely new phosphating bath is the effort to create completely unique coating with extraordinary corrosion resistance on magnesium alloys [7].

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Enhanced Corrosion Resistance and Photocatalytic

2019-1-7  Magnesium Alloy by Phosphating Dong Liu1,2,3, Junchao Huang1, Yong Zhou2 and Yigang Ding2,* 1 School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, China;[email protected](L.D.); [email protected] (H.J.) 2 Key Lab for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology,

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Improvement of anticorrosion and adhesion to

2010-7-28  phosphating process, Zn2+ ions were also reduced to Zn and deposited on the magnesium alloy surface. 3.3 Effects of phosphate bath compositions on adhesion of paint to magnesium alloy The first adhesion and second adhesion of the paint on theISO 2409

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Effect of phosphating solution pH value on the

2021-3-5  The effect of pH value of phosphating solution on the formation process of micro-cracks was studied, and the corrosion resistance of phosphate CCs on AZ91D magnesium alloy was also analyzed in 3.5 wt% NaCl solution by using potentiodynamic polarization test, electrochemical impedance spectroscopy (EIS) analysis, and immersion test.

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Manganese Phosphate Coating Manganese

2021-1-13  Manganese phosphating is mainly by immersion. Treatment times range from 5-20 minutes, the optimum time depending on the surface condition. The bath operating temperature is around 95 °C and only in special cases can satisfactory coatings be

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Automatic Corrosion Treatment of Magnesium

The technological process is as adhesion and corrosion resistance of phosphating film follows: 600#-800# abrasive paper grinding → and coating; the other is excessive pickling, resulting in washing → acetone ultrasonic cleaning → washing → the surface corrosion of magnesium alloy and rough degreasing → washing → pickling → washing

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Preparation Conditions on Surface Properties

2018-12-18  phosphating process (urea was used to reduce the speed of the phosphating process). Moreover, the addition of a solution containing hydrogen peroxide and 1,2,3-benzotriazole to the acid at the stage of etching was proposed and investigated [9]. The effect of each process on the morphology of manganese phosphate crystals was examined by

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ELECTROCHEMICAL CHARACTERISTICS OF SHOT-PEENED

2012-1-19  Phosphating conversion films of the magnesium alloy were widely used to the base film of paint for ensuring good contact between the paint film and the magnesium alloy substrate [14, 15]. 2 Material and Experimental Methods 2.1 Experimental material An AE21 magnesium alloy with chemical composition in Table 1 was used as experimental material.

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Phosphating and Dacromet process of fasteners

2020-9-23  Phosphating process category: According to different performances, it can be divided into: rust removal and phosphating process, wear-resistant film reduction lubricating phosphating process, and pre-paint phosphating process. This process can replace iron and steel electroplating zinc, cadmium, zinc-based alloy, hot-dip galvanizing, hot

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PHOSPHATING.NET Phosphating of Metals

2021-1-13  Phosphating of metals is one of the most important of surface treatment methods and a number of modern metal finishing procedures would not be possible without it. The main areas of application of phosphating are; * Corrosion protection in conjunction with organic coatings, e.g., paints and polymer films, * Facilitation of cold-forming

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