Effect of Sealing Agents on the Corrosion Behaviour of Sulphamic acid Anodized Alumina Films

Raj, V.; Kanagaraj, D.; Mohan, S.

doi:10.1080/00202967.2003.11871504

Cited by 2 publications

(3 citation statements)

References 17 publications

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“…Thus, the presence of phosphate ions in/on the unsealed anodic oxide layer or in the sealing bath electrolyte is likely to retard the kinetics of the sealing step by suppressing hydration processes [157,164,205,206,[321][322][323]. This tendency has indeed been confirmed in various reports [37,324,325]. However, phosphates have been reported as components in multi-component sealing solutions [326].…”

Section: Effect Foreign Anions and Cations On The Crystallization Of mentioning

confidence: 90%

The Sealing Step in Aluminum Anodizing: A Focus on Sustainable Strategies for Enhancing Both Energy Efficiency and Corrosion Resistance

2020

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Increasing demands for environmental accountability and energy efficiency in industrial practice necessitates significant modification(s) of existing technologies and development of new ones to meet the stringent sustainability demands of the future. Generally, development of required new technologies and appropriate modifications of existing ones need to be premised on in-depth appreciation of existing technologies, their limitations, and desired ideal products or processes. In the light of these, published literature mostly in the past 30 years on the sealing process; the second highest energy consuming step in aluminum anodization and a step with significant environmental impacts has been critical reviewed in this systematic review. Emphasis have been placed on the need to reduce both the energy input in the anodization process and environmental implications. The implications of the nano-porous structure of the anodic oxide on mass transport and chemical reactivity of relevant species during the sealing process is highlighted with a focus on exploiting these peculiarities, in improving the quality of sealed products. In addition, perspective is provided on plausible approaches and important factors to be considered in developing sealing procedures that can minimize the energy input and environmental impact of the sealing step, and ensure a more sustainable aluminum anodization process/industry.Coatings 2020, 10, 226 2 of 55 sealing methods. Furthermore, the applicability of another hitherto popular sealing process; chromate sealing, is currently limited to essential parts in the aerospace industry due to toxicological, health, and environmental implications traced to Cr(VI) employed in the process [7][8][9][10][11][12][13][14][15][16]. On the other hand, the advantages of another industrially utilized sealing process; the nickel fluoride (cold) sealing process is limited by the toxicity of nickel salts which narrows its range of application, and introduces added costs due to post-sealing wastewater treatments and management [17][18][19][20]. Further efforts at sealing anodized aluminum at temperatures lower than that used in hydrothermal (high temperature) sealing, have led to much variety in the chemical constitution and operating temperatures of sealing baths [21]. On the basis of temperature at which the sealing step is carried out, sealing can be classified into three major categories; high temperature, mid-temperature, and room-temperature or cold sealing. In this work sealing at temperatures from 0 to 40 • C is classified as low temperature sealing, from ≥ 40 • C to 70 • C as intermediate or mid temperature sealing, and sealing at temperatures > 70 • C as high temperature sealing.

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Section: Effect Foreign Anions and Cations On The Crystallization Of mentioning

confidence: 90%

The Sealing Step in Aluminum Anodizing: A Focus on Sustainable Strategies for Enhancing Both Energy Efficiency and Corrosion Resistance

2020

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“…This may be attributed to the evolution of the hydrogen at the cathode during plating. 20 The maximum current efficiency has been observed at 20% duty cycle for 25 Hz frequency pulse plating at the average current 0?15 A dm 22 1 Effect of pulse duty cycle at various frequencies on thickness of tin deposit 2 Effect of pulse duty cycle at various frequencies on hardness of tin deposit …”

Section: Effect Of Pulse Duty Cycle On Current Efficiencymentioning

confidence: 99%

“…From these results we can conclude that corrosion resistance of the mild steel improved by the coating of tin. 19,21,22 Cyclic voltammetry…”

Section: Electrochemical Impedancementioning

confidence: 99%

Pulse electrodeposition of tin from sulphate bath

Mohan¹,

Rajasekaran²

2009

Surface Engineering

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In the present work, the pulse electrodeposition of tin from sulphate bath containing SnSO 4 , H 2 SO 4 , phenol sulphonic acid, gelatin and ß-napthol has been studied. The influences of pulsed current, duty cycle on the thickness, hardness and current efficiency of the tin deposit were studied. Electrochemical corrosion studies of the deposited tin on mild steel were conducted by potentiodynamic polarisation and electrochemical impedance spectroscopy. Cyclic voltammetry studies using potential sweep of 10 mV s 21 provide information about the potential ranges for tin deposition and stripping. The tin deposit on a brass substrate has been investigated using XRD, SEM and AFM. The XRD analysis revealed that the tin plated is Sn(200) and crystalline. The morphology of tin deposit is a typical fine grained and granular structure as seen from SEM and AFM.

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Effect of Sealing Agents on the Corrosion Behaviour of Sulphamic acid Anodized Alumina Films

Cited by 2 publications

References 17 publications

The Sealing Step in Aluminum Anodizing: A Focus on Sustainable Strategies for Enhancing Both Energy Efficiency and Corrosion Resistance

The Sealing Step in Aluminum Anodizing: A Focus on Sustainable Strategies for Enhancing Both Energy Efficiency and Corrosion Resistance

Pulse electrodeposition of tin from sulphate bath

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