Airflow Dynamics and Aluminum Coating Oxidation Behavior under Electric-Arc Spraying with Airflow Pulsations
The paper aims to investigate the airflow dynamics of electric-arc spraying (EAS) with airflow pulsation. The study is focused on the dynamic structure of the airflow with an obstacle in the form of crossed electrodes at the steady and the pulsating air supply (with a frequency up to 120 Hz). The wo...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-09-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/18/8444 |
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| author | Irina Zakharova Vyacheslav Royanov Valeriy Chigarev |
| author_facet | Irina Zakharova Vyacheslav Royanov Valeriy Chigarev |
| author_sort | Irina Zakharova |
| collection | DOAJ |
| description | The paper aims to investigate the airflow dynamics of electric-arc spraying (EAS) with airflow pulsation. The study is focused on the dynamic structure of the airflow with an obstacle in the form of crossed electrodes at the steady and the pulsating air supply (with a frequency up to 120 Hz). The work was fulfilled using a computer simulation, the airflow “shadow” photo visualization, and the microstructure characterization of the coatings formed. It was found that when air flows along the crossed electrodes with a gap of 2 mm, a depression zone appears in the flow with a pressure drop from 0.56 MPa to 0.01 MPa. The air pulsation resulted in a change in a flow’s dynamic structure towards an increase in the length of the depression zone, which covers most of the arc, affecting the liquid metal oxidation. It is established that the frequency of a droplet formation should match the frequency of the airflow pulsation to minimize the metal oxidation. With the air pulsating at about 65 Hz, the oxide volume fraction in the aluminum coating was reduced by 3.6 times compared to the steady airflow. EAS with airflow pulsation has the potential for technological cost reduction. |
| first_indexed | 2024-03-10T07:56:14Z |
| format | Article |
| id | doaj.art-9345888f6ba24f03a6348bf8c77d201a |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T07:56:14Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-9345888f6ba24f03a6348bf8c77d201a2023-11-22T11:52:49ZengMDPI AGApplied Sciences2076-34172021-09-011118844410.3390/app11188444Airflow Dynamics and Aluminum Coating Oxidation Behavior under Electric-Arc Spraying with Airflow PulsationsIrina Zakharova0Vyacheslav Royanov1Valeriy Chigarev2Department of Welding Equipment and Technologies, Pryazovskyi State Technical University, Universytets’ka Street 7, 87555 Mariupol, UkraineDepartment of Welding Equipment and Technologies, Pryazovskyi State Technical University, Universytets’ka Street 7, 87555 Mariupol, UkraineDepartment of Welding Metallurgy and Technology, Pryazovskyi State Technical University, Universytets’ka Street 7, 87555 Mariupol, UkraineThe paper aims to investigate the airflow dynamics of electric-arc spraying (EAS) with airflow pulsation. The study is focused on the dynamic structure of the airflow with an obstacle in the form of crossed electrodes at the steady and the pulsating air supply (with a frequency up to 120 Hz). The work was fulfilled using a computer simulation, the airflow “shadow” photo visualization, and the microstructure characterization of the coatings formed. It was found that when air flows along the crossed electrodes with a gap of 2 mm, a depression zone appears in the flow with a pressure drop from 0.56 MPa to 0.01 MPa. The air pulsation resulted in a change in a flow’s dynamic structure towards an increase in the length of the depression zone, which covers most of the arc, affecting the liquid metal oxidation. It is established that the frequency of a droplet formation should match the frequency of the airflow pulsation to minimize the metal oxidation. With the air pulsating at about 65 Hz, the oxide volume fraction in the aluminum coating was reduced by 3.6 times compared to the steady airflow. EAS with airflow pulsation has the potential for technological cost reduction.https://www.mdpi.com/2076-3417/11/18/8444electric-arc sprayinggas flowgas dynamicmetal oxidizingoxide |
| spellingShingle | Irina Zakharova Vyacheslav Royanov Valeriy Chigarev Airflow Dynamics and Aluminum Coating Oxidation Behavior under Electric-Arc Spraying with Airflow Pulsations Applied Sciences electric-arc spraying gas flow gas dynamic metal oxidizing oxide |
| title | Airflow Dynamics and Aluminum Coating Oxidation Behavior under Electric-Arc Spraying with Airflow Pulsations |
| title_full | Airflow Dynamics and Aluminum Coating Oxidation Behavior under Electric-Arc Spraying with Airflow Pulsations |
| title_fullStr | Airflow Dynamics and Aluminum Coating Oxidation Behavior under Electric-Arc Spraying with Airflow Pulsations |
| title_full_unstemmed | Airflow Dynamics and Aluminum Coating Oxidation Behavior under Electric-Arc Spraying with Airflow Pulsations |
| title_short | Airflow Dynamics and Aluminum Coating Oxidation Behavior under Electric-Arc Spraying with Airflow Pulsations |
| title_sort | airflow dynamics and aluminum coating oxidation behavior under electric arc spraying with airflow pulsations |
| topic | electric-arc spraying gas flow gas dynamic metal oxidizing oxide |
| url | https://www.mdpi.com/2076-3417/11/18/8444 |
| work_keys_str_mv | AT irinazakharova airflowdynamicsandaluminumcoatingoxidationbehaviorunderelectricarcsprayingwithairflowpulsations AT vyacheslavroyanov airflowdynamicsandaluminumcoatingoxidationbehaviorunderelectricarcsprayingwithairflowpulsations AT valeriychigarev airflowdynamicsandaluminumcoatingoxidationbehaviorunderelectricarcsprayingwithairflowpulsations |