Papers by Keyword: Anti-Corrosion

Abstract: Aniline tetramer decorated fluoroacrylate polymers (PF-TA) were synthesized via a free radical bulk polymerization process, utilizing 2-(perfluorohexyl) ethyl methacrylate and aniline tetramer (TA) as the primary reactants. The PF-TA coatings were characterized by various techniques, sush as FT-IR, SEM, etc. The results indicated that TA was incorporated into the fluoroacrylate polymer backbone. Tafel polarization curves and electrochemical impedance spectroscopy (EIS) were performed to evaluate the corrosion resistance of the PF-TA coatings. The results indicated that compared to polyfluoroacrylate (PF), the PF-TA coatings with optimized TA content exhibited a significant decrease in corrosion current density, from 0.25 μA cm^-2 to 0.0067 μA cm^-2, and an increase in impedance, from 1.17 × 10⁵ Ω cm² to 214.15 × 10⁵ Ω cm². Additionally, the PF-TA coated Q235 carbon steel surpassed the 120 hour salt spray corrosion test, further demonstrating its exceptional anti-corrosion performance. The improvement in anti-corrosion performance was attributed to the incorpration of the electroactive TA on the fluoropolymer.

Abstract: Polyurethane coating has been widely used as a protective coating due to its wide range of mechanical strength, excellent abrasion resistance, toughness, low-temperature flexibility, and chemical resistance, simplicity in production and application, and superior protection on corrosion to mild steel. No studies have been reported utilizing coconut-based/PPG blend polyols to produce polyurethane-based protective coatings on mild steel. Therefore, in this work, we fabricated polyurethane-based protective coating using coconut-based/PPG blend polyols for anti-corrosion application. Due to low adhesion strength of Polyurethane-based protective coating, the incorporation of nano-fillers into the polymer matrix improved the adhesion strength of the coating due to its functional benefits and its effects gave rise to increased intermolecular bonding, hydrogen bonding, van der waals, magnetism, and surface energy. Therefore, we fabricated PANI/PU composite coatings with varied amounts of polyaniline nanoparticles on mild steel using coconut-based/PPG blend polyols exposed in 3.5 wt% NaCl aqueous solution for anti-corrosion application. Characterizations like Fourier Transform Infrared Spectroscopy (FTIR), Potentiodynamic Polarization (Tafel plot), contact angle, adhesion test, FESEM, XRD, and UV-VIS were used in this study. Tafel plot revealed that PU-based and PANI/PU composite coatings exhibited a significant reduction in corrosion current density (I_corr), perhaps due to the adsorption of inhibitor in the surface of the mild steel which reduced corrosion rate of the metal by retarding the anodic process and impeding the corrosive species from the surroundings. Among all fabricated coatings, 0.5-PANI/PU composite coating was the best, having a less corrosion rate of 5.66x10^-5 mmpy compared to others. In addition, its surface was more compact, smooth, rigid, and no voids present at the interface according to the result of FESEM, suggesting better corrosion protection to mild steel. Hence, PU-based protective coating and PANI/PU composite coatings using coconut-based/PPG blend polyols inhibited the penetration of the corrosive species and served as an adequate barrier protection against corrosion for mild steel.

Abstract: In this work, the black rice husk ash (BRHA), a pozzolanic material, was used as a partial replacement in concrete with the weight percentages of 0%, 10%, 20%, 30%, 40% and 50% for enhancing the corrosion resistivity in the marine environment. The compressive strength, corrosion by accelerated corrosion test by impressed voltage (ACTIV), and chloride (Cl⁻) penetration of concrete specimens were investigated after 28 days of curing. For corrosion and chloride penetration analyses, the 20% of BRHA replacement specimen was the most effective concrete specimen because the deformation was not observed within 19 days of the test. The cement specimens with lower BRHA percentages were cracked due to the development of stress by the rust formation. For higher BRHA percentages, the protective Fe₂O₃ was dissolved due to the acidic environment caused by higher chloride accumulation in the cement specimens. The steel rebar was then aggressively attacked by the chloride and it was finally broken. Therefore, the optimization of the BRHA percentage is needed to minimize corrosion. However, the longer curing time of 20% BRHA replacement specimen is required for increasing the compressive strength because its compressive strength is slightly lower than the standard.

Abstract: Weight reduction in automotive and aerospace components can improve energy efficiency, reduce emissions, and increase performance. The adoption of light metals such as aluminium, magnesium and titanium alloys, is essential to these performance improvements; however, these alloys require protective surface coatings to prevent corrosion and resulting mechanical failures during service life. Traditional protective coatings for light-weight materials can be costly in terms of energy, raw materials, and environmental sustainability. New durable coating approaches are required to allow light-weight materials to be fully exploited in high performance applications. Novel Cirrus HybridTM coatings, a recent innovation in surface finishing, can protect a wide range of light metal alloy components using a sustainable, non-toxic process. Cirrus HybridTM coating technology deposits a thin-film, inorganic coating that bonds tightly to the light-metal alloy substrate. The process is energy efficient, does not rely on hazardous chemicals, and is up to 5 times thinner than traditional coatings for light metals. A Cirrus HybridTM coating provides excellent anti-corrosion, scratch, and wear properties, along with superior tribological, electrical, and optical performance. This paper updates the art of these innovative new coating technologies for reducing weight in industrial components without compromising functionality or performance.

Abstract: Based on surface protection problems of the steel part of the landing gear, wear-resisting properties of tungsten carbide-cobalt (WC-Co) particles reinforced epoxy (WRE) coatings were investigated in this paper. The curing process of WRE coating was analyzed by DSC, TG and IR. The wear performance under different rotational speed WRE coating was studied respectively. The specific wear rates of the WRE coating at 560 rpm and 840 rpm are 6.04 ×10⁻⁴ mm³N⁻¹ m⁻¹and 9.55 ×10⁻⁴ mm³N⁻¹ m⁻¹ respectively, about only 60% of that of the uncoated sample. Thus, this could be summarized that WRE coating had a good wear resistance.

Abstract: Based on surface protection problems of the steel part of the landing gear, wear-resisting properties of tungsten carbide-cobalt (WC-Co) particles reinforced epoxy (WRE) coatings were investigated in this paper. The curing process of WRE coating was analyzed by DSC, TG and IR. The wear performance under different rotational speed WRE coating was studied respectively. The specific wear rates of the WRE coating at 560 rpm and 840 rpm are 6.04 ×10⁻⁴ mm³N⁻¹ m⁻¹and 9.55 ×10⁻⁴ mm³N⁻¹ m⁻¹ respectively, about only 60% of that of the uncoated sample. Thus, this could be summarized that WRE coating had a good wear resistance.

Abstract: Nanostructured coatings offer great potential for various applications due to their superior characteristics that are not typically found in conventional coatings. This research aimed at developing a new and improved coating that employs zinc oxide nanopowder as the agent to achieve corrosion resistant properties for a coating. The research project discusses on its corrosion behaviour of epoxy-zinc oxide in different media by measuring its corrosion rate. Mild carbon steel was used as the substrate for the epoxy-zinc oxide coating. The corrosion behavior mechanism of mild steel was investigated in different media, namely fresh water, NaCl solution, HCl solution and NaOH solution. Immersion test was conducted and studied for a period of 60 days, with daily and weekly weighing and immersing. The corrosion rate was calculated and mild steel corrodes in the different environment and degrades in the following trend; HCl → NaCl → NaOH → H₂O.

Abstract: he effect of pass deformation on the microstructure of Al-Mg-Sn-Bi-Ga-In alloy anode was investigated by using SEM, TEM, and EBSD. The results show that when controlling the rolling deformation at 40%, the segregation phases on the Al alloy matrix was the best distributed for the reason of dynamic recrystallization procedure. The electrochemical and anti-corrosion results show that uniform distribution of segregation phase will improve the related properties of Al alloy anode. After optimizing the rolling procedure, the Al alloy anode has more negative electrode potential of about -1.585V(vs.Hg/HgO) and lower hydrogen evolution rate of 0.092mL/ (min·cm2)

Abstract: The material defects in automobile industry caused by correction can be found in different components, such as welded and fastened areas in cars and vehicles. The corrosion appears when components with different conducting properties assembled together in electrolyte substances. Different conducted materials show different potentials which will lead corrosion. The corrosion in components can cause many product problems, such as bad quality, less safety, lower energy efficiency, and higher cost. This paper analyzes the rusty mechanism and anti-corrode in regular coating and nanocoating materials via computer-aided simulation and prototype testing. Both computational simulation and sample testing displayed almost equal results that validate the credibility of analytic method proposed in this paper. Keywords: Nanocoating technology, computational simulation, corrosion control, anti-corrosion, computer-aided modeling

Abstract: Friction-weld Cu-Al has many potential applications to replace the traditional Cu or Al conductor as it has the superior performance and low cost. For ensuring the reliability of Al/Cu metal joints, the mechanical, electrical and long-term properties were investigated by comparing the properties of Cu and Al. The results show that the mechanical properties (tension, impact and hardness) of friction-welded Cu-Al are between the values of Cu and Al, and the welding seam is not the weakest part in mechanical. The electrical resistance of Cu-Al is also between the values of Cu and Al, and does not increase after long-term vibration test and high-low temperature cycle test. The welding seaming is a weak part for salt spray test, it is better to be protected for use.