Redução e substituição do ácido crômico na etapa de condicionamento de ABS para metalização

Kurek, Ana Paula; Sellin, Noeli; Gelsleichter, Michael

doi:10.1590/s0104-14282009000300014

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…Para uma adequada adesão desta camada, a superfície da peça precisa ser modificada por processos químicos e/ou físicos que ocasionam alterações na morfologia e estrutura da superfície do polímero por meio de formação de microcavidades com aumento na rugosidade e aspereza, que proporcionam maior interação metal-polímero e favorecem a adesão da camada metálica [1] . O processo mais empregado pelas indústrias galvânicas para a modificação da superfície de peças em ABS é por imersão delas em banho condicionador composto por solução sulfocrômica (ácido crômico e ácido sulfúrico), na etapa de pré-tratamento do processo de cromagem, ocasionando alterações na superfície, que favorecem a adesão da camada metálica [2] . O terpolímero ABS (acrilonitrila-butadieno-estireno) é o polímero mais empregado na fabricação de peças cromadas com função decorativa, principalmente devido à sua composição e estrutura química.…”

Section: Introductionunclassified

Tratamento químico superficial e metalização de ABS, PVC e blendas de PVC/ABS

et al. 2015

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ResumoVisando à substituição do ABS em peças cromadas, amostras de PVC e blendas de PVC/ABS, na razão mássica de 20/80, 40/60 e 60/40, foram submetidas ao pré-tratamento em solução sulfocrômica sob diferentes condições de concentração, tempo e temperatura e sendo em seguida cromadas. As modificações na superfície das peças após o condicionamento foram analisadas por microscopia eletrônica de varredura, microscopia de força atômica e rugosidade. A qualidade da deposição metálica foi avaliada por inspeção visual e teste de adesão. Os resultados mostraram que, aumentando a concentração de PVC nas peças necessitou-se de condições operacionais mais agressivas, tais como maiores temperaturas de banho, tempo de imersão e concentração de solução sulfocrômica para que ocorresse a adesão da camada metálica. De todas as condições testadas com a solução condicionante sulfocrômica no tratamento das peças de PVC e blendas PVC/ABS de 20/80 e 40/60, a concentração de 350 g/L de ácido crômico e 400 g/L de ácido sulfúrico, temperatura de 70°C e tempo de imersão de 15 minutos, ocasionou deposição do metal em toda a superfície das peças, as quais foram aprovadas nos testes de adesão e corrosão. Palavras-chave: cromagem, ABS, PVC, blendas PVC/ABS. AbstractTo replace ABS in plated objects, samples of PVC and blends of PVC/ABS, in mass ratio of 20/80, 40/60 and 60/40, were subjected to step-conditioning (etching) in sulfochromic solution, under different conditions of concentration, time and temperature, being plated in sequence. Modifications of the surface of the samples after conditioning were analyzed by scanning electron microscopy, atomic force microscopy and roughness. The quality of metal deposition was evaluated by visual inspection and adhesion tests. Results show that increasing the amount of PVC in the blend required more aggressive operational conditions to promote metallic adhesion; higher temperature, immersion time and sulfochromic solution concentration. From all tested conditions with the sulfochromic solution for the treatment of PVC, and 20/80 and 40/60 PVC/ABS blend samples, the concentration of 350 g L -1 of chromic acid and 400 g L -1 of sulfuric acid at 70 o C and immersion time of 15 minutes, resulted in the deposition of metal layers in all evaluated specimens. These were approved in adhesion and corrosion tests. Keywords: plating, ABS, PVC, PVC/ABS blends. IntroduçãoA galvanoplastia em polímeros é um tipo de tratamento de superfície muito utilizado, e ao contrário do que ocorre com os metais, nos quais a camada metálica depositada tem uma utilidade anticorrosiva, em polímeros, possui finalidade estética e decorativa. Para uma adequada adesão desta camada, a superfície da peça precisa ser modificada por processos químicos e/ou físicos que ocasionam alterações na morfologia e estrutura da superfície do polímero por meio de formação de microcavidades com aumento na rugosidade e aspereza, que proporcionam maior interação metal-polímero e favorecem a adesão da camada metálica [1] . O processo mais empregado pelas...

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Section: Introductionunclassified

Tratamento químico superficial e metalização de ABS, PVC e blendas de PVC/ABS

et al. 2015

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“…Immersion time in the etching solution also has considerable influence on the degree of the surface modification, usually 5–15 min are sufficient to form a large number of small cavities in the surface. If treatment time is too long, in some cases the amount of formed pores may exceed the depth of 1–2 µm on the sample surface and affect metal adhesion . When used in industrial application, a treatment time longer than 15 min can reduce productivity, making it impossible to process.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of the etching and chrome plating on the ABS, PVC, and PVC/ABS blends surface

Kurek

Dotto

Araújo

et al. 2016

J of Applied Polymer Sci

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As replacement for acrylonitrile-butadiene-styrene (ABS), which is commonly used in the manufacture of chrome parts, polyvinyl chloride (PVC) and PVC/ABS blend parts were produced by injection process, etched in sulfochromic solution in different concentrations, immersion time, and temperature, and they were subsequently chrome-plated by conventional method. After etching, the sample surfaces were analyzed by Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), roughness, and contact angle, and compared with the ABS surface. The metal deposition was assessed by visual inspection and adhesion test. The roughness influenced the adhesion of the metal layer directly. The chemical etching increased the surface wettability. To achieve a good metal layer adhesion, higher temperatures, immersion time, and etching solution concentration were necessary. A concentration of 350 g/L chromic acid and 400 g/L sulfuric acid, a 70 8C temperature and a 15 min immersion time resulted in good adhesion in PVC and PVC/ABS blends.

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“…There are methods of modifying the surface that use plasma or laser as an alternative technique, but they present the disadvantage of the large investment costs required for commercialization. New processes are being proposed to replace these chromium steps [5][6][7] among which the process using polymerization of the conducting polymer PPy on the surface of the ABS polymer has proved promising because, instead of being carried out in several steps, it is performed in only two steps and then the surface of the polymer is prepared to receive the subsequent metallic electrodeposition [5]. The objective of this manuscript is the chemical activation process with the polymerization of a conductive polymer and subsequent metallization on the surface of the pieces of non-conducting polymers, ABS, HIPS and PLA, manufactured with fusion and deposition modeling equipment.…”

Section: Introductionmentioning

confidence: 99%

Metallic Surface Coating of Polymeric Parts Produced by Additive Manufacturing Process

Almeida

Pisani

Camargo

et al. 2020

MSF

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Metal coating films were deposited on the surface of the pieces of non-conducting polymers, acrylonitrile butadiene styrene (ABS), high impact polystyrene (HIPS) and poly (lactic acid) (PLA). These three polymers have been used since they are the main raw materials available for fusion and deposition molding equipment. In order to achieve surface metallization by electrodeposition, it was necessary to apply a pre-treatment using the chemical polymerization technique in solution with the electroconductive polymer polypyrrole (PPy) was deposited on the specimens. A uniform layer of PPy was deposited on the surface of the specimens of the ABS and HIPS polymers, while in the specimen of the polymer PLA this layer showed uniformity faults. After this pretreatment was possible to perform copper electrodeposition, creating the metallic coatings on the ABS / PPy, HIPS / PPy and PLA / PPy surfaces. This metallic coating was uniform in all specimens except the one of the PLA polymer that was not sanded. The adhesion of the coating was evaluated by the adhesion test with tape and the quality of the appearance (absence of visual defects), the morphology, the uniformity, the thickness, the conductivity and the adhesion quality of the films were analyzed.

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Redução e substituição do ácido crômico na etapa de condicionamento de ABS para metalização

Cited by 5 publications

References 6 publications

Tratamento químico superficial e metalização de ABS, PVC e blendas de PVC/ABS

Tratamento químico superficial e metalização de ABS, PVC e blendas de PVC/ABS

Evaluation of the etching and chrome plating on the ABS, PVC, and PVC/ABS blends surface

Metallic Surface Coating of Polymeric Parts Produced by Additive Manufacturing Process

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