Grain refinement promotes the formation of phosphate conversion coating on Mg alloy AZ91D with high corrosion resistance and low electrical contact resistance
The application of Mg and its alloys in 3C (i.e. Computer, Communication and Consumer Electronic) industries requires a strict combination of corrosion resistance and low electrical contact resistance (ECR). The conventional design of conversion coating relies on a thick and compact layer to offer a...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-03-01
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| Series: | Corrosion Communications |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2667266921000013 |
| _version_ | 1818718855624654848 |
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| author | Peng Zhou Lixin Yang Yaojun Hou Guoqing Duan Baoxing Yu Xuejie Li Yunfei Zhai Bo Zhang Tao Zhang Fuhui Wang |
| author_facet | Peng Zhou Lixin Yang Yaojun Hou Guoqing Duan Baoxing Yu Xuejie Li Yunfei Zhai Bo Zhang Tao Zhang Fuhui Wang |
| author_sort | Peng Zhou |
| collection | DOAJ |
| description | The application of Mg and its alloys in 3C (i.e. Computer, Communication and Consumer Electronic) industries requires a strict combination of corrosion resistance and low electrical contact resistance (ECR). The conventional design of conversion coating relies on a thick and compact layer to offer active protectiveness but compromises the electric conductivity. In this work, phosphate conversion coatings (PCC) with low electrical contact resistance were prepared on the sand-cast and die-cast Mg alloy AZ91D, respectively. The microstructural differences, ECR and corrosion resistance were observed and compared. Results show that the PCCs on die-cast alloy have a thickness of 300-400 nm, and are more compact than those on sand-cast counterparts. Interestingly, PCCs of the die-cast exhibit lower ECR, which indicates a mild impact of the improved compactness on ECR. Meanwhile, corrosion resistance of the PCCs on die-cast alloy is greatly improved, which is attributed to the intensified micro-galvanic effect through the grain refinement of the die-cast alloy. It evidently promotes the electrochemical reactions during the conversion treatment to yield high quality PCC. |
| first_indexed | 2024-12-17T19:57:41Z |
| format | Article |
| id | doaj.art-6bb4e933557f4a43bdaff7f0a4d75b05 |
| institution | Directory Open Access Journal |
| issn | 2667-2669 |
| language | English |
| last_indexed | 2024-12-17T19:57:41Z |
| publishDate | 2021-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Corrosion Communications |
| spelling | doaj.art-6bb4e933557f4a43bdaff7f0a4d75b052022-12-21T21:34:34ZengElsevierCorrosion Communications2667-26692021-03-0114757Grain refinement promotes the formation of phosphate conversion coating on Mg alloy AZ91D with high corrosion resistance and low electrical contact resistancePeng Zhou0Lixin Yang1Yaojun Hou2Guoqing Duan3Baoxing Yu4Xuejie Li5Yunfei Zhai6Bo Zhang7Tao Zhang8Fuhui Wang9The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaShenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, ChinaShi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; Corresponding authors.Chimie ParisTech, PSL Research University, CNRS, Institut de Recherche de Chimie Paris (IRCP), Paris F-75005, FranceShanghai Aerospace Equipments Manufacturer Co. Ltd., Shanghai 200245, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaShenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China; Corresponding authors.Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, ChinaThe application of Mg and its alloys in 3C (i.e. Computer, Communication and Consumer Electronic) industries requires a strict combination of corrosion resistance and low electrical contact resistance (ECR). The conventional design of conversion coating relies on a thick and compact layer to offer active protectiveness but compromises the electric conductivity. In this work, phosphate conversion coatings (PCC) with low electrical contact resistance were prepared on the sand-cast and die-cast Mg alloy AZ91D, respectively. The microstructural differences, ECR and corrosion resistance were observed and compared. Results show that the PCCs on die-cast alloy have a thickness of 300-400 nm, and are more compact than those on sand-cast counterparts. Interestingly, PCCs of the die-cast exhibit lower ECR, which indicates a mild impact of the improved compactness on ECR. Meanwhile, corrosion resistance of the PCCs on die-cast alloy is greatly improved, which is attributed to the intensified micro-galvanic effect through the grain refinement of the die-cast alloy. It evidently promotes the electrochemical reactions during the conversion treatment to yield high quality PCC.http://www.sciencedirect.com/science/article/pii/S2667266921000013Conversion coatingCorrosion resistanceMg alloyGrain refinementGalvanic corrosion |
| spellingShingle | Peng Zhou Lixin Yang Yaojun Hou Guoqing Duan Baoxing Yu Xuejie Li Yunfei Zhai Bo Zhang Tao Zhang Fuhui Wang Grain refinement promotes the formation of phosphate conversion coating on Mg alloy AZ91D with high corrosion resistance and low electrical contact resistance Corrosion Communications Conversion coating Corrosion resistance Mg alloy Grain refinement Galvanic corrosion |
| title | Grain refinement promotes the formation of phosphate conversion coating on Mg alloy AZ91D with high corrosion resistance and low electrical contact resistance |
| title_full | Grain refinement promotes the formation of phosphate conversion coating on Mg alloy AZ91D with high corrosion resistance and low electrical contact resistance |
| title_fullStr | Grain refinement promotes the formation of phosphate conversion coating on Mg alloy AZ91D with high corrosion resistance and low electrical contact resistance |
| title_full_unstemmed | Grain refinement promotes the formation of phosphate conversion coating on Mg alloy AZ91D with high corrosion resistance and low electrical contact resistance |
| title_short | Grain refinement promotes the formation of phosphate conversion coating on Mg alloy AZ91D with high corrosion resistance and low electrical contact resistance |
| title_sort | grain refinement promotes the formation of phosphate conversion coating on mg alloy az91d with high corrosion resistance and low electrical contact resistance |
| topic | Conversion coating Corrosion resistance Mg alloy Grain refinement Galvanic corrosion |
| url | http://www.sciencedirect.com/science/article/pii/S2667266921000013 |
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