Synthesis of corundum rich coating on 7055 aluminum alloy by micro-arc oxidation and its corrosion resistant property in a saline medium

Ji, Renlong; Liu, Li; Yin, Hongxia; Li, Weiyun; Sun, Jie; Zhu, Pengcheng; Cao, Chuanbao

doi:10.1016/j.surfcoat.2023.130182

Cited by 6 publications

(2 citation statements)

References 65 publications

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“…The film formation rate during the transition to soft spark discharge is about 0.088 μm/s, and the film formation rate during the soft spark discharge treatment is about 0.026 μm/s. The film formation rate of the PEO ceramic layer under soft spark discharge is much higher than that of the conventional PEO ceramic layer, which is in agreement with what has been documented in the literature [ 26 , 27 , 28 , 29 ]. It is noteworthy that the film formation rate during the transition to soft spark discharge is much higher than that during soft spark discharge—a phenomenon that has not been reported.…”

Section: Resultssupporting

confidence: 91%

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Study of Coating Growth Direction of 6061 Aluminum Alloy in Soft Spark Discharge of Plasma Electrolytic Oxidation

Wang,

Yang,

Liu

et al. 2024

Materials

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Conventional plasma electrolytic oxidation treatments produce oxide coatings with micron-scale discharge pores, resulting in insulation and wear and corrosion resistance far below that expected of highly dense Al2O3 coatings. The introduction of cathodic polarization during the plasma electrolytic oxidation process, especially when the applied cathode-to-anode current ratio (Rpn) is greater than 1, triggers a unique plasma discharge phenomenon known as “soft sparking”. The soft spark discharge mode significantly improves the densification of the anode ceramic layer and facilitates the formation of the high-temperature α-Al2O3 phase within the coating. Although the soft spark discharge phenomenon has been known for a long time, the growth behavior of the coating under its discharge mode still needs to be studied and improved. In this paper, the growth behavior of the coating before and after soft spark discharge is investigated with the help of the micro-morphology, phase composition and element distribution of a homemade fixture. The results show that the ceramic layer grows mainly along the oxide–electrolyte direction before the soft spark discharge transformation; after the soft spark discharge, the ceramic layer grows along the oxide–substrate direction. It was also unexpectedly found that, under soft spark discharge, the silicon element only exists on the outside of the coating, which is caused by the large size and slow migration of SiO32−, which can only enter the ceramic layer and participate in the reaction through the discharge channel generated by the strong discharge. In addition, it was also found that the relative phase content of α-Al2O3 in the coating increased from 0.487 to 0.634 after 10 min of rotary spark discharge, which is an increase of 30.2% compared with that before the soft spark discharge transition. On the other hand, the relative phase content of α-Al2O3 in the coating decreased from 0.487 to 0.313 after 20 min of transfer spark discharge, which was a 55.6% decrease compared to that before the soft spark discharge transformation.

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Section: Resultssupporting

confidence: 91%

“…Al 2 O 3 has an α-Al 2 O 3 phase in addition to the γ-Al 2 O 3 phase, and it has been reported [ 28 ] that γ-Al 2 O 3 transforms to α-Al 2 O 3 when the temperature is in the range of 1323–1473 K, as shown in Equation (15).

…”

Section: Discussionmentioning

confidence: 99%

Study of Coating Growth Direction of 6061 Aluminum Alloy in Soft Spark Discharge of Plasma Electrolytic Oxidation

Wang,

Yang,

Liu

et al. 2024

Materials

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Mechanically Durable and Fluorine‐Free Ni–Cr Alloy‐Based Highly Hard Superhydrophobic Coating on Al Alloy

Pan,

Zhou,

et al. 2024

Adv Eng Mater

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Superhydrophobic coatings, known for their water‐repelling properties, play an important role in corrosion resistance and self‐cleaning applications. This study addresses the pressing need for eco‐friendly and durable fabrication methods for metal surfaces, particularly Al alloys, recognized for their inherent low mechanical properties. The innovative electroplating technique successfully fabricates superhydrophobic coatings on Al alloy surfaces, incorporating a high‐hardness Ni–Cr alloys layer and a low‐surface‐energy stearic acid layer. The resulting coatings exhibit outstanding mechanical durability, corrosion resistance, and self‐cleaning capabilities. With a water contact angle of 165° and a corrosion protection efficiency of 98.6%, these coatings offer a substantial improvement over traditional methods. Moreover, the Leeb hardness of the coated alloy experiences an impressive 83% increase compared to pristine Al alloy. This universally applicable approach opens avenues for developing mechanically robust superhydrophobic coatings on various metallic substrates, with broad implications for engineering applications.

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Effect of changes in organo-silicon electrolyte concentration and composition on SiO2 ceramic coating prepared by plasma electrolytic oxidation on 6061 aluminum alloy

Chen,

Kang,

et al. 2024

Ceramics International

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Synthesis of corundum rich coating on 7055 aluminum alloy by micro-arc oxidation and its corrosion resistant property in a saline medium

Cited by 6 publications

References 65 publications

Study of Coating Growth Direction of 6061 Aluminum Alloy in Soft Spark Discharge of Plasma Electrolytic Oxidation

Study of Coating Growth Direction of 6061 Aluminum Alloy in Soft Spark Discharge of Plasma Electrolytic Oxidation

Mechanically Durable and Fluorine‐Free Ni–Cr Alloy‐Based Highly Hard Superhydrophobic Coating on Al Alloy

Effect of changes in organo-silicon electrolyte concentration and composition on SiO2 ceramic coating prepared by plasma electrolytic oxidation on 6061 aluminum alloy

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