Cu-Sn Coatings Produced Using Environmentally Non-Aggressive Electrolyte Containing Sodium Tartrate

Silva, Priscila Santos da; Senna, Lílian Ferreira de; Lago, Dalva Cristina Baptista do

doi:10.1590/1980-5373-mr-2016-0962

Cited by 11 publications

(12 citation statements)

References 32 publications

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“…The metallic coating mass (m deposited ) was also obtained from this analysis. These results and the theoretical mass were used to calculate the cathodic current efficiency, E f , for each deposition time 15,38,39 .…”

Section: Alloy Electrodepositionmentioning

confidence: 99%

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Electrodeposition of Co-rich Cu-Co Alloys from Sodium Tartrate Baths Using Direct (DC) and Single Pulsed Current (SPC)

2019

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Cu-Co alloys were electrodeposited on steel substrates from alkaline sodium tartrate electrolyte using direct and single pulsed current (DC and SPC, respectively). The electrodeposition bath was composed by 0.02 mol L −1 of CuSO 4 .5H 2 O, 0.10 mol L −1 of CoSO 4 .7H 2 O and 0.50 mol L −1 of Na 2 C 4 H 4 O 6 .4H 2 O. Using both kind of deposition processes, it was verified that the applied current density (j) affected the cathodic current efficiency (E f ), the copper and cobalt contents in the coatings (wt. % Cu and wt. % Co, respectively), the morphology and the anticorrosive performance of the coatings (based on the transfer charge resistance, (R ct ) values). Comparing the results obtained for DC and SPC coatings, those produced by single pulsed current improved the E f values and decreased the grain sizes. Concerning the conditions used in this work, the coating produced under the conditions of Experiment 4', using j m = 40 A m -2 and SPC mode, presented 15.9 wt. % Co, the most compact morphology, the smallest grain size and the highest R ct value after 24 h of exposure in the saline medium.

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Section: Alloy Electrodepositionmentioning

confidence: 99%

“…. This curve presents a typical profile of steel in an electrolytic bath for copperalloy coating produced 8,11,14,15,39 . It is possible to note a less negative linear region (from the OCP until approximately -1.0 V SSE ), related to copper deposition from charge transfer processes.…”

Section: Cyclic Voltammetry Experimentsmentioning

confidence: 99%

Electrodeposition of Co-rich Cu-Co Alloys from Sodium Tartrate Baths Using Direct (DC) and Single Pulsed Current (SPC)

2019

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“…Geralmente, revestimentos produzidos contendo maiores teores de Sn são relatados como apresentando características anticorrosivas. Silva et al [12] mostraram que revestimentos de Cu-Sn produzidos a partir de banho contendo tartarato de sódio apresentaram propriedade anticorrosiva em meio de NaCl 0,5 mol.L -1 apenas quando a composição dos filmes foi próxima àquela do bronze comercial (95% m/m Cu e 5% m/m Sn). Surme et al [4] também obtiveram revestimentos Cu-Sn produzidos a partir de oxalato de sódio, com boas propriedades anticorrosivas em meio de H 2 SO 4 0,1 mol.L -1 , quando teores de Sn no revestimento ≥ 25,4% m/m foram obtidos.…”

Section: Figuraunclassified

“…Trabalhos anteriores do nosso grupo de pesquisa já mostraram que é possível a obtenção de revestimentos de ligas de cobre utilizando banhos não agressivos ao ambiente, apresentando brilho e boa aderência [5,7,10]. Para a eletrodeposição de ligas Cu-Sn, contudo, existem poucos trabalhos utilizando complexantes não agressivos [11][12][13]. Em alguns casos, estas substâncias têm sido estudadas apenas como aditivo ao banho e não como agente complexante [14][15].…”

Section: Introductionunclassified

Produção e caracterização de revestimentos de ligas metálicas Cu-Sn em banho eletrolítico contendo glicina: ensaios preliminares

2019

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RESUMO Os problemas relacionados à corrosão são frequentes, podendo ocorrer nas mais variadas áreas, tais como, nas indústrias química, petroquímica, naval, de construção civil e automobilística, dentre outros setores produtivos. Portanto, métodos para prevenir a corrosão devem ser empregados para evitar a perda de materiais e o uso de revestimentos metálicos tem servido bastante a este propósito. A produção de revestimentos metálicos permite modificar a superfície do substrato levando à formação de um material funcional que apresenta as propriedades e características desejadas, no caso, resistência à corrosão. Contudo, esses revestimentos são geralmente produzidos usando banhos tóxicos a base de cianeto, o que eleva o custo do processo devido ao tratamento posterior dos rejeitos gerados. O presente trabalho propõe um estudo inicial para a produção de revestimentos de ligas de Cu-Sn com propriedades anticorrosivas, a partir de banho eletrolítico menos agressivo, apresentando diferentes concentrações iônicas de cobre e estanho. Os revestimentos foram eletrodepositados em substrato de aço-carbono, utilizando eletrólitos ácidos contendo CuCl2, SnCl2 e glicina. Estes revestimentos foram posteriormente caracterizados através das técnicas de microscopia eletrônica de varredura (MEV), espectroscopia de raios X por energia dispersiva (EDS), espectroscopia de impedância eletroquímica (EIE) e polarização potenciodinâmica. Os resultados de EIE mostraram que os filmes produzidos com maiores teores de cobre apresentaram um aumento nos valores da resistência de transferência de carga (Rtc). Contudo, os ensaios de polarização mostraram que estes filmes não atuaram como revestimentos protetores. As análises morfológicas evidenciaram a formação de revestimentos porosos, o que pode explicar seu pobre comportamento eletroquímico.

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“…Its micro hardness is 902 ± 36 HV 0.1. The deposition of CuSn coatings was performed on Cr coating deposited on cast iron substrates by the electrodeposition technique [33,34]. The CuSn coating on the Cr coating substrate was obtained in a solution containing CuCl 2 ·2H 2 O, SnCl 2 ·2H 2 O and sodium tartrate.…”

Section: Introductionmentioning

confidence: 99%

Wear Behavior of CuSn Coated Piston Ring Sliding against Nodular Cast Iron Cylinder Liner under Heavy-Duty Conditions

et al. 2019

Metals

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In order to investigate the friction and wear behavior between the nodular cast iron cylinder liner (Fe) and CuSn coated piston ring under heavy-duty conditions, piston rings with chromium(Cr) coating and CuSn-Cr coating were tested using the piston ring reciprocating liner test rig at the simulated working conditions of 56 MPa, 200 r/min, 190 • C. Compared with the Cr/Fe pair, the CuSn coating consumption of the CuSn-Cr/Fe pair made friction coefficient and cylinder wear loss decrease by 2.8% and 51.5%, respectively. Different size Sn patches worn from the CuSn coated piston ring were embedded into the cylinder liner surface based on the surface topography. This process was shown to reduce the surface roughness of a cylinder liner and form flatter plateau structures. Chemical elements analysis indicated that plateau structures on the cylinder liner surface matched with CuSn-Cr coated ring are helpful to promote the tribo-chemical reaction and generate the reactive products to protect the mutually contacted asperities.Although surface texturing on the cylinder liner or piston ring is an effective method to improve the wear behavior [7-9], various coatings prepared on the piston rings are also important means to improve heavy-duty friction and wear performance [10]. The CrN coating made by the physical vapor deposition or magnetron sputtering method has shown good high temperature resistance to adhesion [11][12][13][14]. In order to improve the thermal stability, oil compatibility, and internal stress of ceramic coatings, nanocomposite coatings (like TiN, TiAlN, TiSiN and TiSiCN) were developed to minimize the frictional losses and wear of piston rings in an automotive engine [15,16]. Shen et al. compared chromium-based ceramic composite (CKS) and nickel-chromium-molybdenum (NCM) coated rings sliding against cast iron liner and demonstrated that the anti-scuffing behavior of NCM is better than that of the CKS with the failure time as a criterion [17]. Wan et al. indicated that the presence of amorphous graphite-like carbon not only combated the scuffing damage and running instability effectively for conventional chromium-based coatings, but also improved the reliability and robustness of the piston rings [18]. Based on the increasing scuffing resistance experiments, diamond-like carbon (DLC) coated piston ring can protect the cast iron liner from scuffing up to 600 N normal load [19]. Its lower friction coefficient and wear loss were attributed to the formation of a mixed tribolayer [19][20][21]. But the existence of residual stress in the preparation process of DLC coating would cause the coating to crack. If stress concentration exerted on the contact interface was too high, it would lead to the coating wear or peeling [22].Compared with hard coatings, soft coatings have also attracted widespread attention for weakening the friction surface damage. Hamilton et al. investigated the relationship between macroscopic wear and the temperature of the MoS 2 coating [23]. Meng et al. indicated that the stabilized fricti...

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Cu-Sn Coatings Produced Using Environmentally Non-Aggressive Electrolyte Containing Sodium Tartrate

Cited by 11 publications

References 32 publications

Electrodeposition of Co-rich Cu-Co Alloys from Sodium Tartrate Baths Using Direct (DC) and Single Pulsed Current (SPC)

Electrodeposition of Co-rich Cu-Co Alloys from Sodium Tartrate Baths Using Direct (DC) and Single Pulsed Current (SPC)

Produção e caracterização de revestimentos de ligas metálicas Cu-Sn em banho eletrolítico contendo glicina: ensaios preliminares

Wear Behavior of CuSn Coated Piston Ring Sliding against Nodular Cast Iron Cylinder Liner under Heavy-Duty Conditions

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