Atmospheric Corrosion Behavior of 2A12 Aluminum Alloy in a Tropical Marine Environment

Cui, Zhongyu; Li, Yong; Zhang, Huan; Xiao, Kui; Dong, Chaofang; Liu, Zhiyong; Wang, Liwei

doi:10.1155/2015/163205

Cited by 16 publications

(4 citation statements)

References 34 publications

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“…It is seen that the log-log plot of weight loss versus time presents two straight lines taking the 12 month as the turning point. This phenomenon was also observed on 2A12 aluminum alloy in Xisha marine atmosphere in our previous work (Ref 40). The fitting results of the two linear segments are also shown in Fig.…”

Section: Weight Loss Analysissupporting

confidence: 84%

Corrosion Behavior of Field-Exposed 7A04 Aluminum Alloy in the Xisha Tropical Marine Atmosphere

Cui

Cheng

et al. 2015

J. of Materi Eng and Perform

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Atmospheric corrosion behavior of 7A04 aluminum alloy exposed to a tropical marine environment for 4 years was investigated by weight loss test, morphology observation, and electrochemical impendence spectroscopy (EIS). The results showed that the weight loss of 7A04 alloy in the log-log coordinates can be approximately fitted with two liner segments, in which the slope value of the second segment is significantly lower than that of the first segment. This was mainly attributed to the protectiveness of the corrosion product layer formed on the specimen exposed for 12 and 24 months, which was further confirmed by the EIS results. Corrosion rate presented a significant fluctuation during the exposure test which is due to the deterioration effect caused by chloride ions and time of wetness and the stabilization process of the corrosion product layer. Intergranular corrosion occurred on the 7A04 alloy and then transformed into exfoliation corrosion because of the synergetic effect of the hydrogen-assisted crack initiation and the wedge effect-induced matrix delamination.

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Section: Weight Loss Analysissupporting

confidence: 84%

Corrosion Behavior of Field-Exposed 7A04 Aluminum Alloy in the Xisha Tropical Marine Atmosphere

Cui

Cheng

et al. 2015

J. of Materi Eng and Perform

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“…Experimental data show that the R ct of M-Z/CH@SA sample is 4.7941 × 10 6 Ω, which is much higher than the R ct of magnesium alloy substrate 572.5Ω. It also proves that the M-Z/CH@SA sample has excellent corrosion protection performance [31], and Table 2 is the detailed fitting data.…”

Section: Resultsmentioning

confidence: 98%

Preparation of corrosion-resistant hydrophobic composite films on magnesium alloy

Zhu

Jia

2022

Surface Engineering

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Magnesium alloy has attracted wide attention for excellent properties but poor corrosion resistance hinders its application. The method of preparing high-performance corrosionresistant films with low cost and easy operation is significantly crucial to the corrosion protection of magnesium alloy. By synthesizing zeolite film directly on AZ91D magnesium alloy, the work presented a simple, efficient and environmentally-friendly preparation method. In this study, a one-step synthesis method of multi-structure composite film on AZ91D magnesium alloy was explored. The prepared film surface had dense Mg(OH) 2 bottom layer and K 2 Al 2 Si 4 O 12 •xH 2 O upper layer with porous support microstructure. Compared with the substrate, the corrosion current on the sample surface modified by stearic acid was reduced by about three orders of magnitude, and the corrosion inhibition rate reached 99.96% with a stable contact angle of about 125°. The results showed the excellent corrosion resistance and stable hydrophobicity of the prepared sample.

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“…At room temperature, the 2A12 aluminum alloy is less plastic than the 2024 aluminum alloy, with yield strength less than 60% of the 7050 aluminum alloy and a tensile strength less than the 2024 and 7050 aluminum alloy. The 2A12 aluminum alloy is exposed to a tropical marine atmospheric environment, and the corrosion morphology changes from spot corrosion to severe inter-crystal corrosion as the exposure time increases [3]. Wear changes the surface roughness of the 2A12 aluminum 2 of 11 alloy and induces partial dissolution of inter-metallic compound particles.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cu Addition on Properties of an Al-La Alloy

Wang,

Meng,

Song

2023

Coatings

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The effect of copper content on the microstructure and properties of an aluminum copper alloy containing lanthanum was studied by adding 0.5 wt% lanthanum and different contents of copper to the 2A12 alloy. We used a universal testing machine, Brinell hardness tester, and friction and wear testing machine to test the mechanical properties of the alloy. The microstructure and phase composition of the alloy were analyzed using scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction. The results show that, after adding La and Cu, the alloy grain is refined, and the fracture mode changes from dissociation fracture to quasi dissociation fracture. A new phase containing La accumulates at the grain boundary. If the amount of Cu added is too large, the tendency for hot cracking increases, which can easily lead to the formation of voids or even cracks. The tensile strength and hardness of the cast alloy significantly increase with the increase in Cu addition. In the range of adding 2 wt% to 5 wt% Cu, the tensile strength and hardness of the cast alloy increases by approximately 12% and 17.84%, respectively, compared with the original alloy. With the increase in Cu addition, the elongation of the alloy first increases and then decreases, reaching its maximum value when Cu addition is 3 wt%. Adding Cu is beneficial for improving the wear resistance of the alloy. When the addition of Cu is 3 wt%, the alloy has the best wear resistance and minimum wear amount. This is due to the enrichment of La and Cu at the grain boundaries, forming new La phases or other phases with higher hardness, which changes the properties of the alloy. It shows that the content of Cu in the 2A12 alloy can be increased to 7-8% with the increasing of additional rare-earth elements, and a new Al-Cu (7 wt% to 8 wt%)-Mg (1.2 wt% to 1.8 wt%)-Mn (0.3 wt% to 0.9 wt%)-La (0.5 wt%) alloy, in which tensile strength, hardness, and elongation of the alloy are increased by 8.1%, 16%, and 79.1%, respectively, can be formed. In addition, the wear resistance of Al-La alloys also improves significantly with the addition of copper content. The coefficient of friction is reduced by 68% compared with no copper addition.

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Atmospheric Corrosion Behavior of 2A12 Aluminum Alloy in a Tropical Marine Environment

Cited by 16 publications

References 34 publications

Corrosion Behavior of Field-Exposed 7A04 Aluminum Alloy in the Xisha Tropical Marine Atmosphere

Corrosion Behavior of Field-Exposed 7A04 Aluminum Alloy in the Xisha Tropical Marine Atmosphere

Preparation of corrosion-resistant hydrophobic composite films on magnesium alloy

Effect of Cu Addition on Properties of an Al-La Alloy

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