Study on Cathodic Protection Assisted Laser Processing (CPALP) for Reducing Titanium Alloy Surface Oxidation
Received date: 2022-09-23
Revised date: 2022-11-24
Online published: 2023-03-28
Supported by
National Natural Science Foundation of China(51575193);Natural Science Foundation of Guangdong Foundation for Basic and Applied Basic Research(2021A1515010879);Yunfu 2021 Provincial Science and Technology Innovation Strategic Special Fund Project(2021090201);Guangzhou Basic and Applied Basic Research Project(202201011848);Guangzhou Panyu Polytechnic Science and Technology General Project(2021KJ12)
Titanium and its alloys are highly susceptible to surface oxidation during laser processing. To address this issue, a cathodic electric protection laser processing technique based on an inert electrolyte is proposed. Further, to investigate the effectiveness of this technique, the microscopic morphology and the O content of laser processed area were characterized using SEM and EDS under different operating currents and electrolytes. The results prove that the O content of the laser processed area can be reduced by applying the following two approaches: current competition and the enhancement of the electrolyte's inertness. For an electrolyte obtained by dissolving 0.2 mol/L KNaC4H4O6 (potassium sodium tartrate) in 40%EtOH and at an operating current of 600 mA, the processed area exhibited minimal defects, such as cracks and porosity, and the O content was reduced to 4.9%. A voltmeter and a reference electrode were used to determine the working circuit volt-ampere characteristic curve and the cathodic polarization curve. The results revealed that the curves exhibit an evident linear relationship within the operating current range of 150~900 mA. Further analysis supports the relationship between the electrolyte inertness and the O content: enhancing the electrolyte's inertness reduces the supply of H2O in the processing area, thereby preventing the reaction between H2O and Ti through the method of reducing reactants. Consequently, the O content is reduced.
LIANG Liang , JIANG Zhikang , TAN Huanheng , CHEN Jian , JIANG Changcheng , YI Genmiao , LIN Xingui . Study on Cathodic Protection Assisted Laser Processing (CPALP) for Reducing Titanium Alloy Surface Oxidation[J]. Acta Metall Sin, 2024 , 60(12) : 1607 -1614 . DOI: 10.11900/0412.1961.2022.00472
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