Liyan Wang , Keqi Huang , Zi Yang , Rudolph Buchheit , Zhiyuan Feng
{"title":"标准大气压和低温条件下原位制备的 LiAl 层状双氢氧化物对 AZ31 Mg 合金的腐蚀保护研究","authors":"Liyan Wang , Keqi Huang , Zi Yang , Rudolph Buchheit , Zhiyuan Feng","doi":"10.1016/j.clay.2024.107585","DOIUrl":null,"url":null,"abstract":"<div><div>This work successfully prepared Li<img>Al LDHs coatings on AZ31 Mg alloy under standard atmospheric pressure and low temperature. The whole process did not require a hydrothermal autoclave reactor and high pressure. Electrochemical test results showed that the coating was able to provide good corrosion protection performance. The Li<img>Al LDHs coatings provided a large low-frequency impedance on AZ31. When the treatment time was 24 h, the maximum <em>|Z|</em><sub>0.01Hz</sub> at pH = 12 was 5.14 × 10<sup>4</sup> Ω∙cm<sup>2</sup>, which is more than an order of magnitude higher than the <em>|Z|</em><sub>0.01Hz</sub> of 1.81 × 10<sup>3</sup> Ω∙cm<sup>2</sup> for the bare sample. Under the same treatment conditions, the potentiodynamic polarization test results showed that the Li<img>Al LDHs coated samples had a lower corrosion current density and a higher breakdown potential. The <em>i</em><sub>corr</sub> was 1.78 × 10<sup>−7</sup> A/cm<sup>2</sup> and <em>E</em><sub>br</sub> was −0.82 V<sub>SCE</sub> compared to the Mg substrate (<em>i</em><sub>corr</sub> of 1.13 × 10<sup>−5</sup> A/cm<sup>2</sup> and <em>E</em><sub>br</sub> of −1.53 V<sub>SCE</sub>). Additionally, Li<img>Al LDHs coatings also had a significant inhibitory effect on cathodic hydrogen evolution, providing targeted protection to the cathodic areas.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"261 ","pages":"Article 107585"},"PeriodicalIF":5.3000,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Research on the corrosion protection of in-situ prepared LiAl layered double hydroxides on AZ31 Mg alloy under standard atmospheric pressure and low temperature\",\"authors\":\"Liyan Wang , Keqi Huang , Zi Yang , Rudolph Buchheit , Zhiyuan Feng\",\"doi\":\"10.1016/j.clay.2024.107585\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>This work successfully prepared Li<img>Al LDHs coatings on AZ31 Mg alloy under standard atmospheric pressure and low temperature. The whole process did not require a hydrothermal autoclave reactor and high pressure. Electrochemical test results showed that the coating was able to provide good corrosion protection performance. The Li<img>Al LDHs coatings provided a large low-frequency impedance on AZ31. When the treatment time was 24 h, the maximum <em>|Z|</em><sub>0.01Hz</sub> at pH = 12 was 5.14 × 10<sup>4</sup> Ω∙cm<sup>2</sup>, which is more than an order of magnitude higher than the <em>|Z|</em><sub>0.01Hz</sub> of 1.81 × 10<sup>3</sup> Ω∙cm<sup>2</sup> for the bare sample. Under the same treatment conditions, the potentiodynamic polarization test results showed that the Li<img>Al LDHs coated samples had a lower corrosion current density and a higher breakdown potential. The <em>i</em><sub>corr</sub> was 1.78 × 10<sup>−7</sup> A/cm<sup>2</sup> and <em>E</em><sub>br</sub> was −0.82 V<sub>SCE</sub> compared to the Mg substrate (<em>i</em><sub>corr</sub> of 1.13 × 10<sup>−5</sup> A/cm<sup>2</sup> and <em>E</em><sub>br</sub> of −1.53 V<sub>SCE</sub>). Additionally, Li<img>Al LDHs coatings also had a significant inhibitory effect on cathodic hydrogen evolution, providing targeted protection to the cathodic areas.</div></div>\",\"PeriodicalId\":245,\"journal\":{\"name\":\"Applied Clay Science\",\"volume\":\"261 \",\"pages\":\"Article 107585\"},\"PeriodicalIF\":5.3000,\"publicationDate\":\"2024-10-04\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Applied Clay Science\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0169131724003338\",\"RegionNum\":2,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Clay Science","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0169131724003338","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Research on the corrosion protection of in-situ prepared LiAl layered double hydroxides on AZ31 Mg alloy under standard atmospheric pressure and low temperature
This work successfully prepared LiAl LDHs coatings on AZ31 Mg alloy under standard atmospheric pressure and low temperature. The whole process did not require a hydrothermal autoclave reactor and high pressure. Electrochemical test results showed that the coating was able to provide good corrosion protection performance. The LiAl LDHs coatings provided a large low-frequency impedance on AZ31. When the treatment time was 24 h, the maximum |Z|0.01Hz at pH = 12 was 5.14 × 104 Ω∙cm2, which is more than an order of magnitude higher than the |Z|0.01Hz of 1.81 × 103 Ω∙cm2 for the bare sample. Under the same treatment conditions, the potentiodynamic polarization test results showed that the LiAl LDHs coated samples had a lower corrosion current density and a higher breakdown potential. The icorr was 1.78 × 10−7 A/cm2 and Ebr was −0.82 VSCE compared to the Mg substrate (icorr of 1.13 × 10−5 A/cm2 and Ebr of −1.53 VSCE). Additionally, LiAl LDHs coatings also had a significant inhibitory effect on cathodic hydrogen evolution, providing targeted protection to the cathodic areas.
期刊介绍:
Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as:
• Synthesis and purification
• Structural, crystallographic and mineralogical properties of clays and clay minerals
• Thermal properties of clays and clay minerals
• Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties
• Interaction with water, with polar and apolar molecules
• Colloidal properties and rheology
• Adsorption, Intercalation, Ionic exchange
• Genesis and deposits of clay minerals
• Geology and geochemistry of clays
• Modification of clays and clay minerals properties by thermal and physical treatments
• Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays)
• Modification by biological microorganisms. etc...