Layer-by-layer self-assembled polyurea layers onto MAO surface for enhancing corrosion protection to aluminum alloy 6063

Mo, Qiufeng; Qin, Gemei; Ling, Kui; Lv, Xiaoyu; Wang, Nannan; Li, Weizhou

doi:10.1016/j.surfcoat.2020.126653

Cited by 26 publications

(9 citation statements)

References 28 publications

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“…The observed binding energies at 284.6, 285.8, 287.6, and 283.6 eV in Figure 1d are associated with C─C, C─N, C═O, and C─Si bonds, respectively. [ 18,19 ] In the Si 2p spectrum (Figure 1e), a prominent peak at 102.3 eV confirms the presence of a Si─O─Si bond. [ 20 ] The binding energy of N 1s at 399.0 eV is assigned to the amino groups (─NH 2 ).…”

Section: Resultsmentioning

confidence: 99%

An Enhanced Interlayer Construction Strategy for High‐Frequency Copper Clad Laminates: Resolving the Contradiction between Signal Loss and Adhesion

Mei,

Yang,

Lei

et al. 2023

Adv Materials Technologies

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In high‐frequency printed circuit boards (PCBs), there is an inherent contradiction between minimizing signal loss and maximizing adhesion strength. To tackle this issue, this work presents a simple approach by developing an enhanced interlayer through a two‐step process involving anodization/APTES (3‐aminopropyltriethoxysilane) treatment. The anodization yields micro/nano oxide structures with low surface roughness, thereby reducing the skin effect. One side of the enhanced interlayer is mechanically anchored and chemically bonded to copper foils, while the other side is coupled with bismaleimide/triazine‐based resins (BT resins), significantly augmenting the adhesion strength. Eight‐layer PCBs manufactured employing this method exhibit an insertion loss of −1.3553 dB in−1 at 32 GHz. Compared to two conventional brown oxide methods, the insertion loss is reduced by 7.80% and 3.24%, respectively, with a more substantial reduction observed at higher frequencies. The peel strength of samples ranges from 0.554 to 0.589 N mm−1, demonstrating maximum enhancements of 34.78% and 164.13% in comparison to the two brown oxide methods, respectively. Moreover, eight‐layer PCBs undergo lead‐free reflow soldering tests, solder float tests, and thermal fatigue tests without encountering any failures. Consequently, the proposed method holds significant practical significance in addressing the challenge associated with low signal loss and high adhesion strength in high‐frequency PCBs.

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Section: Resultsmentioning

confidence: 99%

An Enhanced Interlayer Construction Strategy for High‐Frequency Copper Clad Laminates: Resolving the Contradiction between Signal Loss and Adhesion

Mei,

Yang,

Lei

et al. 2023

Adv Materials Technologies

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“…The corrosion potential E corr (V) and corrosion current density I corr (A cm −2 ) were analyzed using the Tafel extrapolation method with the built-in software. Based on the Stern–Geary equation, the corrosion rate CR (mm per annum) and polarization resistance R p (Ω cm 2 ) were calculated as follows: 26,27 In this equation, M is the relative atomic mass of the metal (g), n is the ionic valence of the metal; ρ is the density of the metal (g cm −3 ), F is Faraday constant; and β a and β c are the anodic and cathodic Tafel slopes (mV dec −1 ), respectively.…”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

Preparation of HA-MAO coatings on β-type alloys and its corrosion resistance in high glucose environments

Li,

Zou,

Qiu

et al. 2024

RSC Adv.

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“…The critical issues addressed in most inhibitor studies include reducing corrosion current density, enhanced polarization resistance, and the existence of non-ideally behaved capacitance of inhibitor films/layers [28][29][30][31][32][33]. The electrical parameters associated with an inhibitor-induced protective layer could provide a quantitative view of the corrosion resistive properties of an applied inhibitor.…”

Section: Introductionmentioning

confidence: 99%

Evolution and stability of 2-mercaptobenzimidazole inhibitor film upon Al alloy 6061

et al. 2022

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Organic corrosion inhibitors have become competent alternatives to hazardous chrome conversion coatings due to their rapid adsorption over metal surfaces in corrosive environments. Literature suggests a wide range of organic corrosion inhibitors with high inhibition efficiency, barrier properties, and adsorption mechanisms. However, the long-term durability and protectiveness of an organic inhibitor film need to be understood with in-depth insights on its interaction with heterogenous alloy surfaces like AA6xxx, reduction of galvanic activities and time-resolved degradation due to ionic diffusion. The present article is focused on the time-resolved adsorption and degradation of 2-mercaptobenzimidazole (2-MBI)-induced inhibitor layer/film over AA6061 in 0.1 M NaCl solution. Electrochemical and surface analysis data indicate that the presence of 2-MBI drives the rapid formation of a 20–30 nm thick protective film comprised of constitutional elements of C, S, and N from 2-MBI upon the surface of AA6061 substrate. This film mitigated the corrosion cells associated with nano- and micro-sized Fe and Si-rich intermetallic particles (IMPs) in AA6061. XPS reveals two distinguished bonding states of S and N in the inhibitor film and chemical interactions between 2-MBI and the surface of AA6061. The protective film maintained 65% inhibiting efficiency after 1 day, which progressively degraded due to electrolyte ingress and eventually with a drop in inhibition efficiency down to 21% after 14 days. Inhibitor-induced film over AA6061 reduced the corrosion susceptibility of Fe, and Si-rich IMPs up to 1 day given the subsequent adsorption by S and N heteroatoms. However, this film became thick and defective after 1 day, which undermined its barrier properties against ingress of aggressive ions and facilitated water adsorption. Graphical abstract

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Layer-by-layer self-assembled polyurea layers onto MAO surface for enhancing corrosion protection to aluminum alloy 6063

Cited by 26 publications

References 28 publications

An Enhanced Interlayer Construction Strategy for High‐Frequency Copper Clad Laminates: Resolving the Contradiction between Signal Loss and Adhesion

An Enhanced Interlayer Construction Strategy for High‐Frequency Copper Clad Laminates: Resolving the Contradiction between Signal Loss and Adhesion

Preparation of HA-MAO coatings on β-type alloys and its corrosion resistance in high glucose environments

Evolution and stability of 2-mercaptobenzimidazole inhibitor film upon Al alloy 6061

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