Effects of Nanoporous Structure of Anodic Films on Adhesive Strength between Aluminum Alloys and Polyamide Resin

Sato, Kota; Asoh, Hidetaka; Yamamoto, Hiroaki

doi:10.2320/matertrans.mt-l2021006

Cited by 8 publications

(5 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[3][4][5][6][7][8] Anodization (or anodic oxidation, anodizing) is a surface treatment approach employed to protect or design metal surfaces for commercial applications. [9,10] Although preparing nanoporous films using anodization is simple and more costeffective than other approaches (e.g., lithography, sol-gel, and…”

Section: Introductionmentioning

confidence: 99%

“…Anodization (or anodic oxidation, anodizing) is a surface treatment approach employed to protect or design metal surfaces for commercial applications. [ 9,10 ] Although preparing nanoporous films using anodization is simple and more cost‐effective than other approaches (e.g., lithography, sol–gel, and template‐based), direct electrical connection to the workpiece in an electrolyte is indispensable. [ 1,2 ] There will be more variation in developing new materials independent of the specimen's shape and size if the need for direct energization is eliminated.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5][6][7][8] Anodization (or anodic oxidation, anodizing) is a surface treatment approach employed to protect or design metal surfaces for commercial applications. [9,10] Although preparing The synthesis of Janus particles is an interesting application of bipolar electrochemistry. [15][16][17] In a direct current (DC) electric field, when a BPE is placed between two driving electrodes, the redox reaction proceeds at the opposite ends of the BPE, forming a Janus object with two different faces.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of Multiphase Metal Balls via Maskless Localized Anodization Based on Bipolar Electrochemistry

Asoh

Mizota

Kokubo

2022

Adv Materials Inter

Self Cite

View full text Add to dashboard Cite

template-based), direct electrical connection to the workpiece in an electrolyte is indispensable. [1,2] There will be more variation in developing new materials independent of the specimen's shape and size if the need for direct energization is eliminated.Eliminating direct energization is advantageous, especially when processing small objects electrochemically. If the coating is a metal layer rather than an oxide film, a wireless method such as the barrel-plating process can be used industrially. Barrel plating, which involves placing the items in a barrel-shaped cage, is generally used for plating a high volume of smaller metal parts (e.g., bolts, nuts, and screws) at one time. However, in the case of anodization, an approach like barrel-plating cannot be applied because the coating is an insulator (i.e., alumina). Furthermore, the site-selective control of redox reaction on metal objects is not possible in a rotating barrel. Therefore, for anodization, the objects (the metal parts) are physically held by racking (e.g., clamping and bolting) to maintain the position and supply electrical current during the anodization process (Figure S1, Supporting Information). If the racking and unracking processes employed in an industry can be eliminated, the work efficiency of mass production can be enhanced. Furthermore, the electrical contact where the rack touches the metal (so-called rack mark) can also be eliminated. The rack mark's size and position on the metal surface may affect the performance (e.g., corrosion resistance and wear resistance) of the finished product because the contact remains as an exposed metal surface. Thus, developing surface treatment approaches that do not require electrical contact is highly desirable.Novel surface treatment approaches based on bipolar electrochemistry can resolve the above-mentioned issues. Recently, bipolar electrochemistry has attracted renewed interest in material science, bioscience, and related research fields. [11][12][13][14] Unconnected conductive objects, such as bipolar electrodes (BPEs), are placed between the outer electrodes (so-called driving electrodes) in bipolar electrochemistry. The experimental setup of bipolar electrochemistry is different compared to a conventional two-or three-electrode system. Since BPEs do not require a direct electrical connection to the external power supply, they can be prepared using different arrangements. Reduction-oxidation (redox) reactions, driven by the reaction's standard electrode potential, occur on BPEs under a potential gradient.

show abstract

“…[3][4][5][6][7][8] Anodization (or anodic oxidation, anodizing) is a surface treatment approach employed to protect or design metal surfaces for commercial applications. [9,10] Although preparing nanoporous films using anodization is simple and more costeffective than other approaches (e.g., lithography, sol-gel, and…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…[3][4][5][6][7][8] Anodization (or anodic oxidation, anodizing) is a surface treatment approach employed to protect or design metal surfaces for commercial applications. [9,10] Although preparing The synthesis of Janus particles is an interesting application of bipolar electrochemistry. [15][16][17] In a direct current (DC) electric field, when a BPE is placed between two driving electrodes, the redox reaction proceeds at the opposite ends of the BPE, forming a Janus object with two different faces.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design of Multiphase Metal Balls via Maskless Localized Anodization Based on Bipolar Electrochemistry

Asoh

Mizota

Kokubo

2022

Adv Materials Inter

Self Cite

View full text Add to dashboard Cite

show abstract

“…Conventional methods to improve the bond strength of the epoxy resin-copper interface include chemical oxidation treatment of the copper plate, 5,6) roughening of the Ni plating film, 7,8) and laser roughening of the copper plate. 9) Anodization on aluminum plates 10) and laser roughening of the steel plates 11) have also been investigated for bonding of resin-metals other than copper. All of these methods aim at an anchor effect by roughening the surface of the metal base material.…”

Section: Introductionmentioning

confidence: 99%

Improvement in Copper-Resin Bond Strength after High-Temperature Testing Using C–H–Si Thin Film

2022

View full text Add to dashboard Cite

The bonding between copper and epoxy resin is investigated using a CHSi thin film to achieve highly adhesive and reliable bonding between the resin mold and the copper substrate in power modules. In this study, high-temperature (473 K) testing is performed to improve the reliability of this junction after high-temperature operation. The bond strength decreases and delamination occurs at the filmcopper interface after high-temperature testing. The decrease in bond strength may be due to the decrease in the filmcopper interfacial strength because of the decrease in the binding force between copper and oxygen upon heating. When Fe and Cr, which have high oxygen bond disassociation energies, are intercalated at the filmcopper interface, the bond strength improves after high-temperature testing and a bond strength above 30 MPa was retained after 1000 h.This study is a novel method of dissimilar bonding based on chemical and physical effects of CHSi film existing between copper and resin. Further, it is an effective method of bonding to achieve high-temperature operation of a resin-molded power module, which can contribute to future advancements in power electronics products.

show abstract

“…In addition, anodic porous alumina has been utilized as a template and mask for fabrication of various nanostructured materials [4][5][6][7][8] and as an adherend for coating and adhesion. 9 The device properties and their performance depend on the porous structure of anodic films; thus, it is important to precisely control the dimensions of porous films, e.g., film thickness, pore diameter, interpore distance, pore density, and the regularity of the pore arrangement.…”

mentioning

confidence: 99%

Effect of Propanol on Growth Rate of Anodic Porous Alumina in Sulfuric Acid

Asoh¹,

Kadokura²,

Murohashi³

et al. 2022

J. Electrochem. Soc.

Self Cite

View full text Add to dashboard Cite

Previously, we studied the anodization of aluminum by adding alcohol to common acidic electrolytes with a focus on film formation efficiency and the hardness of the anodic oxide film. In this study, we focus on the difference in carbon number of monohydric alcohols and select propanol as an additive to confirm whether the effects of adding alcohol on anodization behavior and the growth rate of anodic film are universal regardless of the alcohol type. The tendency of propanol concentration dependence of conductivity and viscosity was generally consistent with results obtained using methanol and ethanol additives; however, unlike other alcohols, the steady state voltage during constant current anodization decreased with an increased amount of propanol. Unlike sulfuric acid only, the addition of propanol clearly improved film growth rate and current efficiency under mild conditions below 100 A‧m−2 and high current density conditions above 500 A‧m−2.

show abstract

Effects of Nanoporous Structure of Anodic Films on Adhesive Strength between Aluminum Alloys and Polyamide Resin

Cited by 8 publications

References 21 publications

Design of Multiphase Metal Balls via Maskless Localized Anodization Based on Bipolar Electrochemistry

Design of Multiphase Metal Balls via Maskless Localized Anodization Based on Bipolar Electrochemistry

Improvement in Copper-Resin Bond Strength after High-Temperature Testing Using C–H–Si Thin Film

Effect of Propanol on Growth Rate of Anodic Porous Alumina in Sulfuric Acid

Contact Info

Product

Resources

About