Research on the corrosion protection of in-situ prepared LiAl layered double hydroxides on AZ31 Mg alloy under standard atmospheric pressure and low temperature

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science Pub Date : 2024-10-04 DOI:10.1016/j.clay.2024.107585

Liyan Wang , Keqi Huang , Zi Yang , Rudolph Buchheit , Zhiyuan Feng

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引用次数: 0

Abstract

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 i_corr was 1.78 × 10⁻⁷ A/cm² and E_br was −0.82 V_SCE compared to the Mg substrate (i_corr of 1.13 × 10⁻⁵ A/cm² and E_br of −1.53 V_SCE). Additionally, LiAl LDHs coatings also had a significant inhibitory effect on cathodic hydrogen evolution, providing targeted protection to the cathodic areas.

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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

这项研究在标准大气压和低温条件下，成功地在 AZ31 Mg 合金上制备了 LiAl LDHs 涂层。整个过程不需要水热高压釜反应器和高压。电化学测试结果表明，涂层具有良好的防腐蚀性能。LiAl LDHs 涂层在 AZ31 上产生了较大的低频阻抗。当处理时间为 24 小时时，pH = 12 时的最大|Z|0.01Hz 为 5.14 × 104 Ω∙cm2，比裸样品的|Z|0.01Hz（1.81 × 103 Ω∙cm2）高出一个数量级以上。在相同的处理条件下，电位极化测试结果表明，锂铝 LDHs 涂层样品的腐蚀电流密度较低，击穿电位较高。与镁基底（icorr 为 1.13 × 10-5 A/cm2 和 Ebr 为 -1.53 VSCE）相比，icorr 为 1.78 × 10-7 A/cm2 和 Ebr 为 -0.82 VSCE。此外，锂铝 LDHs 涂层对阴极氢演化也有显著的抑制作用，为阴极区域提供了有针对性的保护。

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

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...