Microstructural characterization and film-forming mechanism of a phosphate chemical conversion ceramic coating prepared on the surface of 2A12 aluminum alloy

Huang, Shuai; Wang, Jian; Wei, Xiaowei; Zhou, Yi; Wang, Lijun; Zhang, Jianjun

doi:10.1039/c9ra01173k

Cited by 11 publications

(5 citation statements)

References 58 publications

(47 reference statements)

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“…The formation of cracks is mainly attributed to the dehydration of the phosphate coating during the aging process during drying. The main chemical reaction of the aluminum alloy in a chromate system phosphating solution is as follows: , 2 Al + 6 H 3 PO 4 + 6 NaF → 2 normalAlF 3 ↓ + 3 normalH 2 ↑ + 6 NaH 2 PO 4 Al + H 2 CrO 4 + 2 H 3 PO 4 → CrPO 4 · 4 H 2 O ↓ + AlPO 4 ↓ 2 Al + 6 H 3 PO 4 → 2 Al ( H 2 PO 4 ) 3 + 3 ...…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…The pretreatment before phosphating is described in ref , and the sample preparation and performance tests are shown in Scheme . In the phosphating step, the bare aluminum sheets were immersed in the phosphating bath (containing 5 g L –1 chromium trioxide, 3 g L –1 sodium fluoride, and 25 g L –1 phosphoric acid) at 50 °C for 1, 5, 10, 30, and 60 min and then washed three times with warm deionized water.…”

Section: Methodsmentioning

confidence: 99%

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A Slippery Liquid-Infused Network-like Surface with Anti/De-icing Properties Constructed Based on the Phosphating Reaction

et al. 2022

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The excessive accumulation of ice seriously threatens various industrial facilities and production activities. Currently, slippery liquid-injected porous surfaces (SLIPS) have been developed as a new strategy for anti/de-icing; however, the lack of research on the adsorption and storage capacity for lubricating fluids has limited the development of SLIPS in the anti/de-icing field to some extent. In this work, a slippery liquid-infused phosphate network-like surface (SLIPNS) is prepared that adjusts the texture of the surface by varying the phosphating time to control the adsorption and storage of lubricating fluids. The as-obtained surface structure gives the SLIPNS excellent oil-storage/locked properties, can delay the freezing time of sessile droplets up to 436 s, which is almost 10 times that of an untreated aluminum sheet, and exhibits one-tenth the ice adhesion strength of untreated aluminum substrates (14.39 kPa). In addition, the SLIPNS shows effective durability and antifouling ability and has great potential in solving long-term anti/de-icing problems.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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A Slippery Liquid-Infused Network-like Surface with Anti/De-icing Properties Constructed Based on the Phosphating Reaction

et al. 2022

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“…The formation of PCC is mainly divided into two parts: the dissolution of Al substrate and surface alumina and the deposition of insoluble phosphate [18]. Huang et al [19] prepared PCC on the surface of 2A12 Al alloy by chemical conversion. The corrosion current density of PCC is three orders of magnitude lower than that of the 2A12Al matrix after immersing the PCC in 3.5 wt.% NaCl solution for 30 min, and the corrosion inhibition efficiency of PCC can be as high as 99.91%.…”

Section: Coating Types On the Surface Of Aluminum Alloy For Anti-corr...mentioning

confidence: 99%

Preparation and Applications of Superhydrophobic Coatings on Aluminum Alloy Surface for Anti-Corrosion and Anti-Fouling: A Mini Review

Zhu,

Du,

Liu

et al. 2023

Coatings

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Aluminum alloy is widely used in many fields for its excellent performance. However, in practical application, aluminum alloy is easy to become corroded and be invalidated, owing to the influence of environmental factors. Some pollutants or corrosive media q5 its surface adhesion will further deepen the failure rate of aluminum alloy, resulting in a large amount of workforce waste, waste of material and financial resources, and energy consumption. So the anti-corrosion and anti-fouling treatment of aluminum alloy surfaces to expand their practical application range and reduce energy loss are of great significance. In this paper, we first summarize the types of anti-corrosion and anti-fouling coatings on aluminum alloy surfaces. We found that superhydrophobic coating has attracted widespread attention recently because of its surface’s non-wetting and low surface energy characteristics. The superhydrophobic coating refers to a coating with a water contact angle on its surface greater than 150° and a sliding angle of less than 10°. Preparing superhydrophobic coatings on the surface of aluminum alloy can improve the corrosion resistance and anti-pollutant adhesion ability at the same time. Therefore, in the following part of the review, the preparation methods of superhydrophobic coatings on aluminum alloy surfaces for anti-corrosion and anti-fouling and the significant problems encountered in the practical application of the superhydrophobic coating on aluminum alloy surfaces, such as poor anti-corrosion durability and poor mechanical stability, and the existing methods to solve these critical problems, are summarized and discussed in detail. Finally, we put forward some new solutions to solve these vital issues.

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“…2A12 aluminum alloy is reinforced with excellent plastic forming ability, high strength and outstanding corrosion resistance. It finds extensive applications in the aerospace and aviation industries (Du et al, 2019;Huang et al, 2019;Wang et al, 2024;Xie et al, 2022). However, aluminum alloys for aircraft are vulnerable to environmental factors such as salt spray and humid air when flying in coastal areas, leading to severe corrosion damage (Alexopoulos et al, 2011;Deng et al, 2023;Liang et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Correlation between the initial aging of epoxy coatings and the typical marine atmospheric environmental factors

Song,

Qin,

Zhou

et al. 2023

ACMM

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Purpose The anticorrosion coatings used in marine and atmospheric environment are subjected to many environmental factors. And the aging failure has been puzzling researchers. The purpose of this study is to find the correlation between the initial aging of epoxy coatings and the typical marine atmospheric environmental factors. Design/methodology/approach The epoxy coatings were subjected to a one-year exposure in three typical marine atmospheres. Meanwhile, principal component analysis, linear regression and Spearman and gray correlation analysis were applied to quantify the environmental characteristics and establish correlations with the coating aging. Findings The results indicate that the coating will undergo macroscopic fading and chalking upon exposure to the marine atmosphere, while microscopic examination reveals holes, cracks and partial peeling. The adhesion performance and electrochemical properties of the coating deteriorated with prolonged exposure, coating aging mainly occurs with the generation of O-H bonds and the breakage of molecular chains such as C-N and C-O-C. The coating was most deeply aged after exposure to the Xisha, followed by Zhoushan and finally Qingdao. Environmental factors affect the photooxidative aging and hydrolytic degradation processes of coatings and thus coating aging. To further demonstrate the correlation between environmental factors and coating aging, principal component analysis was used. The correlation model between environmental factors and coating aging was subsequently obtained. The correlation model between the rate of coating adhesion loss (E) and the comprehensive evaluation parameter of environmental factors (Z) is expressed as E = 0.142 + 0.028Z. Meanwhile, the Spearman correlation analysis and gray correlation method were used to investigate the impact of each environmental factor on coating aging. Solar irradiation, relative humidity and wetting time have the highest correlation with coating aging, which are all above 0.8 and have the greatest influence on coating aging; wind speed and temperature have the smallest correlation with coating aging, which are about 0.6 and have the least influence on coating aging. Originality/value This paper establishes a correlation between typical marine environmental factors and coating aging performance, which is crucial for predicting the service life of other coatings in diverse environments.

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Microstructural characterization and film-forming mechanism of a phosphate chemical conversion ceramic coating prepared on the surface of 2A12 aluminum alloy

Abstract: Phosphate chemical conversion (PCC) ceramic coatings on the surface of 2A12 aluminum alloy substrate have been fabricated by a simple and inexpensive chemical conversion process in CrO3–NaF–H3PO4 solution.

Cited by 11 publications

References 58 publications

A Slippery Liquid-Infused Network-like Surface with Anti/De-icing Properties Constructed Based on the Phosphating Reaction

A Slippery Liquid-Infused Network-like Surface with Anti/De-icing Properties Constructed Based on the Phosphating Reaction

Preparation and Applications of Superhydrophobic Coatings on Aluminum Alloy Surface for Anti-Corrosion and Anti-Fouling: A Mini Review

Correlation between the initial aging of epoxy coatings and the typical marine atmospheric environmental factors

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