Anodising Process

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Mohd Nazree Derman - One of the best experts on this subject based on the ideXlab platform.

  • authorversionAMR.173.55.pdf
    2017
    Co-Authors: Mohd Nazree Derman
    Abstract:

    This paper is study on Anodising Process. The mixed solution of H3PO4+CH3COOH was used to create the AAO film withcontrolled morphology. This mixed solution as anodizing electrolytes can decrease the filmdissolution rate and then increase the film formation efficiency and improve the film properties.However, optimum parameter which need for this Process is very difficult to achieve because thebehaviours of the porous AAO film properties strictly influenced by anodizing Process parametersuch as anodizing voltage, electrolyte temperature, acid concentration and duration of anodizingProcess. The study approach on anodizing Process has been explored by using H3PO4+CH3COOHto obtain the nanostructured porous AAO film on aluminium substrate. Thus, a new hypothesis hasbeen generated to explore the relationship between anodizing parameters and substrate properties onnanostructured AAO film in microstructural and chemical properties in order to enlarge its usageespecially in electronic applications.

  • STUDY OF ANODISED PM ALUMINIUM MATRIX COMPOSITE REINFORCED WITH 15 wt % SAFFIL ¥ ALUMINA SHORT FIBRE
    2015
    Co-Authors: Mohd Nazree Derman, Zainal Arifin Ahmad, Luay Bakir Hussain, Mohd Sharif
    Abstract:

    A study of wear behaviour on anodised PM aluminium matrix composites (AMC) reinforced with Saffil ¥ alumina short fibres was done. AMC was fabricated by powder metallurgy methods (PM) with using Al flake powders and Saffil ¥ alumina short fibres. AMC reinforced with 15 wt % Saffil¥ alumina short fibre was selected because it showed optimum mechanical and physical properties. Sulphuric acid Anodising Process was performed and the objective is to obtain suitable parameters of sulphuric acid concentration, Anodising voltage and Anodising time on MMC. The study of Anodising Process was carried out with various sulphuric acid concentrations (from 0 to 20 % volume), Anodising voltage (10 V to 20 V) and Anodising time (from 0 to 60 minutes) at room temperature. Scanning electron microscope (SEM) was used to investigate coating morphology and thickness. From the research, Anodising voltage of 18 V and 15 % vol H2SO4 in Anodising time of 60 minutes were suitable parameters for sulphuric acid Anodising of this AMC. SEM showed the coating thickness around 20 Pm. From the reserch, it was found that H2SO4 Anodising was able to give good coating to MMC

  • The Effect of Electrolyte Temperature on Formation of Porous Aluminium Oxide Films in Anodising Process
    2013
    Co-Authors: Juyana A. Wahab, Mohd Nazree Derman, Zuraidawani Che Daud, Taman Pertiwi Indah
    Abstract:

    A porous aluminium oxide film formed on aluminium was prepared in a mixed electrolyte of phosphoric acid and acetic acid solution. The morphology, growth and thickness of the film were investigated. The Anodising Process was done by varying the Anodising temperature from 5 °C to 25 °C. The constant Anodising voltage was applied at 130 V and the Anodising was done in the mixture of H

  • A Study on the Effect of Modified Electrolyte to the Formation of AAO Membrane in Anodising Process
    Advanced Materials Research, 2013
    Co-Authors: Juyana A. Wahab, Muhamad Nur Misbah, Nurul Diyana Jamil, Mohd Nazree Derman
    Abstract:

    The formation of anodic aluminium oxide (AAO) membrane in Anodising Process has been studied. The Anodising Process was done in two different type of electrolyte which are single phosphoric acid and a mixture of phosphoric acid and acetic acid. This study was done to determine the influence of this mixed electrolyte toward the formation of AAO membrane. The Anodising voltage was control from 90V to 130V while concentration, time, and temperature were kept constant at 1M, 60 minute and 15°C respectively. The characterisation of the AAO membrane was done by using scanning electron microscopy (SEM). The results of this study confirm that the addition of organic acid in the acidic based electrolyte resulted to the larger pores size of AAO membrane.

  • Corrosion behaviour of anodised powder metallurgy aluminium-magnesium composites
    Advanced Materials Research, 2013
    Co-Authors: Kamrosni Abdul Razak, Mohd Nazree Derman
    Abstract:

    The corrosion behavior of anodized powder metallurgy Al/2wt%Mg composites reinforced with the short fibre alumina SaffilTM was studied using potentiodynamic polarization in 3.5% NaCl solutions. The materials under investigation were fabricated using powder metallurgy route. Anodising Process has been done to the materials to improve their corrosion resistance. Anodising Process were carried out in sulphuric acid solutions with different anodizing voltage, which are 10V, 12V, 14V, 16V and 18V and different concentration of sulphuric acid (5%, 10%, 15%, 20% and 25%). Results from Tafel plot showed that corrosion behavior of PM Al-Mg composites strongly depends on the anodizing parameters. Corrosion resistance increases with the increase in anodizing voltage and concentration of sulphuric acid. The maximum corrosion resistance was recorded by the PM Al-Mg composite anodized using 16V and in the 15% concentration of sulphuric acid.

M G S Ferreira - One of the best experts on this subject based on the ideXlab platform.

L Guerrarosa - One of the best experts on this subject based on the ideXlab platform.

Luis Domingues - One of the best experts on this subject based on the ideXlab platform.

Gary W. Critchlow - One of the best experts on this subject based on the ideXlab platform.

  • Fatigue and fracture assessment of toxic metal replacement coatings for aerospace applications
    Transactions of The Institute of Metal Finishing, 2012
    Co-Authors: Alistair Cree, M. Devlin, Gary W. Critchlow, T. Hirst
    Abstract:

    AbstractThe use of corrosion resistant and adhesion promoting films and coatings is established industrial practice for many fatigue sensitive components and structures. However, recent environmental legislation restricting the use of a range of toxic heavy metals and their derivative Processes, such as chromic acid Anodising (CAA), has meant that a number of new coatings systems and pretreatments are currently being developed to replace the traditional Processes still in use. Typical of these new systems are the boric–sulphuric acid Anodising (BSAA) Process, which can be modified to provide excellent adhesive bonding properties, the sulphuric acid Anodising Process, which includes an additional electrolytic phosphoric acid deoxidising stage (EPAD) to produce a duplex oxide layer, and the recently patented ACDC sulphuric acid Anodising Process which produces a two layered oxide film which can be tailored to produce different porosity volume fractions within each layer. This communication reports the preli...

  • Fatigue and fracture assessment of toxic metal replacement coatings for aerospace applications
    2010
    Co-Authors: Alistair Cree, M. Devlin, Gary W. Critchlow, T. Hirst
    Abstract:

    The use of corrosion resistant and adhesion promoting films and coatings is established industrial practice for many fatigue sensitive components and structures. However, recent environmental legislation restricting the use of a range of toxic heavy metals and their derivative Processes, such as chromic acid Anodising (CAA), has meant that a number of new coatings systems and pretreatments are currently being developed to replace the traditional Processes still in use. Typical of these new systems are the boric–sulphuric acid Anodising (BSAA) Process, which can be modified to provide excellent adhesive bonding properties, the sulphuric acid Anodising Process, which includes an additional electrolytic phosphoric acid deoxidising stage (EPAD) to produce a duplex oxide layer, and the recently patented ACDC sulphuric acid Anodising Process which produces a two layered oxide film which can be tailored to produce different porosity volume fractions within each layer. This communication reports the preliminary findings of a study carried out to assess the fatigue response of Al2618:T6 aluminium alloys to these new Processes. In contrast to CAA Anodising, the initial results indicate that the EPAD and ACDC Processes do not appear to have a significant effect on fatigue

  • Novel methods, incorporating pre- and post-Anodising steps, for the replacement of the Bengough–Stuart chromic acid Anodising Process in structural bonding applications
    International Journal of Adhesion and Adhesives, 2009
    Co-Authors: Keith A. Yendall, Gary W. Critchlow
    Abstract:

    Abstract The present investigation focuses on novel Anodising Processes which are being developed for the replacement of the hexavalent chromium containing 40/50 V Bengough–Stuart Process, with particular emphasis on their resultant performance in structurally bonded systems used in the demanding and harsh environments encountered on operational aircraft. An electrolytic phosphoric acid-based deoxidiser (EPAD) has been studied in combination with a standard sulphuric acid anodise. It has been shown that the EPAD provides an open porous structure in order to enhance adhesion to the modified sulphuric acid anodised (SAA) surface. Additionally, a post-Anodising (PAD) treatment has been used to aid structural adhesion in combination with the SAA Processes. As a control, the standard 40/50 V Bengough–Stuart chromic acid Anodising (CAA) has been used as a baseline performance indicator in adhesion tests. Single-lap shear (SLS) and modified Boeing wedge tests were used to determine adhesion performance. SLS tests were used to determine initial, dry joint strengths whilst wedge test joints immersed in deionised water for up to 100 h gave a measure of joint durability. Overall, excellent initial joint strengths and durability have been found with both EPAD plus SAA and PAD plus SAA Processes suggesting that these environmentally benign treatments may be used as possible drop-in replacements for the currently used hexavalent chromium Process. Electron microscopy has been used to investigate the topographical changes introduced to the surface by the various surface pretreatments under investigation to provide an explanation for the observed adhesion test results.

  • novel methods incorporating pre and post Anodising steps for the replacement of the bengough stuart chromic acid Anodising Process in structural bonding applications
    International Journal of Adhesion and Adhesives, 2009
    Co-Authors: Keith A. Yendall, Gary W. Critchlow
    Abstract:

    Abstract The present investigation focuses on novel Anodising Processes which are being developed for the replacement of the hexavalent chromium containing 40/50 V Bengough–Stuart Process, with particular emphasis on their resultant performance in structurally bonded systems used in the demanding and harsh environments encountered on operational aircraft. An electrolytic phosphoric acid-based deoxidiser (EPAD) has been studied in combination with a standard sulphuric acid anodise. It has been shown that the EPAD provides an open porous structure in order to enhance adhesion to the modified sulphuric acid anodised (SAA) surface. Additionally, a post-Anodising (PAD) treatment has been used to aid structural adhesion in combination with the SAA Processes. As a control, the standard 40/50 V Bengough–Stuart chromic acid Anodising (CAA) has been used as a baseline performance indicator in adhesion tests. Single-lap shear (SLS) and modified Boeing wedge tests were used to determine adhesion performance. SLS tests were used to determine initial, dry joint strengths whilst wedge test joints immersed in deionised water for up to 100 h gave a measure of joint durability. Overall, excellent initial joint strengths and durability have been found with both EPAD plus SAA and PAD plus SAA Processes suggesting that these environmentally benign treatments may be used as possible drop-in replacements for the currently used hexavalent chromium Process. Electron microscopy has been used to investigate the topographical changes introduced to the surface by the various surface pretreatments under investigation to provide an explanation for the observed adhesion test results.

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