Surface and Electrochemical Characteristics of Novel Chromate-Free Mn-V Oxyanion Sealed Tartaric–Sulfuric Acid Anodized Coating

Yoganandan, G.; Balaraju, J.N.; Manikandanath, NT; Ezhilselvi, V.; Srivastava, Meenu; Nagacharan, K. V.; Anilchandra, A. R.; Manjunatha, C. M.

doi:10.1007/s11665-018-3648-4

Cited by 6 publications

(4 citation statements)

References 30 publications

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“…Another finding worth mentioning was reported by Yoganandan et al [29]. They reported standard TSA anodizing (0.2 M H 2 SO 4 + 0.5 M tartaric acid, 20 mA/cm 2 , 28 • C, 30 min) of AA 2024 T3 followed by sealing with 0.08 M KMnO 4 and 0.04 M NH 4 VO 3 (78 • C, 30 min).…”

Section: Common Cr(vi)-free Anodizing Alternativesmentioning

confidence: 73%

Incorporation of Anions into Anodic Alumina—A New Track in Cr(VI) Anodizing Substitution?

Tomczyk,

Stępniowski

2024

Materials

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Aluminum technical alloys are well known for their outstanding mechanical properties, especially after heat treatment. However, quenching and aging, which improve the mechanical properties, by the formation of Cu-rich zones and phases that are coherent with the matrix and block the dislocation motion, cause uneven distribution of the elements in the alloy and consequently make it prone to corrosion. One method providing satisfactory corrosion protection of aluminum alloys is anodizing. On an industrial scale, it is usually carried out in electrolytes containing chromates that were found to be cancerogenic and toxic. Therefore, much effort has been undertaken to find substitutions. Currently, there are many Cr(VI)-free substitutes like tartaric–sulfuric acid anodizing or citric–sulfuric acid anodizing. Despite using such approaches even on the industrial scale, Cr(VI)-based anodizing still seems to be superior; therefore, there is an urge to find more complex but more effective approaches in anodizing. The incorporation of anions into anodic alumina from the electrolytes is a commonly known effect. Researchers used this phenomenon to entrap various other anions and organic compounds into anodic alumina to change their properties. In this review paper, the impact of the incorporation of various corrosion inhibitors into anodic alumina on the corrosion performance of the alloys is discussed. It is shown that Mo compounds are promising, especially when combined with organic acids.

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Section: Common Cr(vi)-free Anodizing Alternativesmentioning

confidence: 73%

Incorporation of Anions into Anodic Alumina—A New Track in Cr(VI) Anodizing Substitution?

Tomczyk,

Stępniowski

2024

Materials

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“…Yoganandan conducted research about the use of Mn and V in sealing through tartaric sulfuric anodization (TSA) which was compared to chromic acid anodization (CAA). Its results showed that the mechanical properties of TSA and CAA samples were similar 22 .…”

Section: Introductionmentioning

confidence: 93%

Analysis of the Mechanical Properties of Anodized Al-Si Alloys

et al. 2022

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Aluminum alloys have been widely used in multiple applications, such as in civil construction and engine pistons. They are subjected to loads that may impair their mechanical properties. Thereby, this research aims to study the influence of anodization on the mechanical properties of alloy samples and evaluate the behavior of oxide films when subjected to tensile testing. The mechanical properties of specimens have been evaluated based on tensile and Knoop hardness tests, and strain, tensile strength, and modulus of elasticity of specimens have been determined based on the stress-strain curve. The morphology of oxide films was analyzed by scanning electron microscopy (SEM) and optical microscopy (OM). Results of anodized Al-Si alloys in both modes, i.e. pulsed and direct currents, were compared, and it was found that pulsed current was more efficient than direct current with respect to uniformity of the formed film, and that the anodization process can affect a few mechanical properties of samples. The tension testing results also revealed that the oxide film has been fractured perpendicularly towards traction. However, the oxide film hardness was not affected by the anodization mode (pulsed or direct currents). In addition, a heat treatment was efficient at improving the uniformity of anodic films.

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“…3,4,21,22 However, little information has been provided on the effects of the presence of the TSA anodic layer on the fatigue behavior of the treated components. [23][24][25] To balance the negative effects of anodizing on the fatigue resistance of structural parts in the high-cycle regime and at the same time guarantee the high mechanical performance required in the aeronautical field, it is possible to adopt specific surface engineering processes before anodizing, such as peening processes, capable of locally introducing residual compressive stress fields to slow down the propagation of fatigue cracks or even prevent their nucleation. [26][27][28] In order for such processes to provide the required increase in fatigue life, the induced residual stress field must possess certain characteristics, such as an adequate depth of penetration, a predetermined depth and intensity of the residual stress peak, and a well-defined trend reversal point.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the anodizing in tartaric–sulfuric acid (TSA) solution is an electrochemical process, recently developed by Airbus, which favors the growth of an anodic barrier layer characterized by corrosion properties comparable to those obtained by chromic anodizing 3,4,21,22 . However, little information has been provided on the effects of the presence of the TSA anodic layer on the fatigue behavior of the treated components 23–25 …”

Section: Introductionmentioning

confidence: 99%

The role of peening processes as a pre‐treatment to anodizing on fatigue behavior of aircraft aluminum alloy

Renna,

Attolico,

Moramarco

et al. 2024

Fatigue Fract Eng Mat Struct

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In this work, the possibility of employing shot peening and laser peening as pre‐treatments to a tartaric–sulfuric anodizing process on the fatigue behavior of 7050‐T7451 aluminum alloy components was investigated. The surface modifications and stress fields induced by the combination of the peening and anodizing processes were evaluated by scanning electron microscopy and residual stress assessment methodologies based on diffraction techniques, respectively. It was found that the anodizing process alone results in a significant reduction in fatigue life compared to the as‐machined condition especially in the high‐cycle fatigue (HCF) region of the S–N diagrams due to the presence of defects within the anodic layer that act as stress concentrators facilitating the initiation of fatigue cracks. The application of both shot and laser peening treatments is demonstrated to offset the negative effects induced by anodizing, offering greater safety margins useful for the design of critical aeronautical structures.

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Surface and Electrochemical Characteristics of Novel Chromate-Free Mn-V Oxyanion Sealed Tartaric–Sulfuric Acid Anodized Coating

Cited by 6 publications

References 30 publications

Incorporation of Anions into Anodic Alumina—A New Track in Cr(VI) Anodizing Substitution?

Incorporation of Anions into Anodic Alumina—A New Track in Cr(VI) Anodizing Substitution?

Analysis of the Mechanical Properties of Anodized Al-Si Alloys

The role of peening processes as a pre‐treatment to anodizing on fatigue behavior of aircraft aluminum alloy

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