Preparation and thermal properties of amorphous Fe–W–B alloy nano-powders

Ge, Yi; Guo, Ying; Zhang, Bangwei; Wang, Lingling; Ouyang, Yifang; Liao, Shuzhi

doi:10.1016/s0924-0136(97)00242-2

Cited by 14 publications

(7 citation statements)

References 14 publications

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“…A partir das micrografias, observou-se a presença de nódulos que possuem morfologia quase esférica, com tamanho de partícula de 20-90 µm. Resultado similar foi observado por Ge et al 26 .…”

Section: Composição E Aparência Do Depósitounclassified

Otimização do banho eletrolítico da liga Fe-W-B resistente à corrosão

Santana¹,

Campos²,

Prasad³

et al. 2007

Quím. Nova

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Recebido em 2/2/06; aceito em 12/6/06; publicado na web em 28/11/06 OPTIMIZATION OF THE ELECTROLYTIC BATH FOR ELECTRODEPOSITION OF CORROSION RESISTANT Fe-W-B ALLOYS. A study on optimization of bath parameters for electrodeposition of Fe-W-B alloys from plating baths containing ammonia and citrate is reported. A 2 3 full factorial design was successfully employed for experimental design analysis of the results. The corrosion resistance and amorphous character were evaluated. The bath conditions obtained for depositing the alloy with good corrosion resistance were: 0.01 M iron sulfate, 0.10 M sodium tungstate and 0.60 M ammonium citrate. The alloy was deposited at 12% current efficiency. The alloy obtained had Ecorr -0.841 V and Rp 1.463 x 10 4 Ohm cm 2 . The deposit obtained under these conditions had an amorphous character and no microcracks were observed on its surface. Besides this, the bath conditions obtained for depositing the alloy with the highest deposition efficiency were: 0.09 M iron sulfate, 0.30 M sodium tungstate and 0.50 M ammonium citrate. The alloy was deposited at 50% current efficiency, with an average composition of 34 wt% W, 66 wt% Fe and traces of boron. The alloy obtained had Ecorr -0.800 V and Rp 1.895 x 10 3 Ohm cm 2 . Electrochemical corrosion tests verified that the Fe-W-B alloy deposited under both conditions had better corrosion resistance than Fe-Mo-B.Keywords: Fe-W-B alloy; electrodeposition; corrosion resistance. INTRODUÇÃOOs revestimentos protetores, além de constituírem uma importante forma de prevenção à corrosão metálica, principalmente a atmosférica, podem melhorar consideravelmente as propriedades fí-sico-químicas das superfícies. Os revestimentos mais comuns são os de cobre, níquel e cromo 1 . A eletrodeposição representa uma boa maneira de revestir as superfícies metálicas 2,3 ; uma das aplicações industriais mais importantes da eletrodeposição é o revestimento com finalidade de inibir a corrosão, que ocorre na superfície do metal e nas suas estruturas sob influência do meio ambiente 4,5 . O termo "codeposição induzida" foi apresentado por Brenner para descrever uma situação em que um metal não pode ser eletrodepositado a partir de solução aquosa na sua forma pura e sim, codepositado na presença de outro metal, formando dessa forma uma liga 6 . Um exemplo de codeposição induzida são as ligas de W com os elementos Ni, Co, e Fe 7,8 . Muitos autores investigaram o processo de eletrodeposição do tungstênio com os metais do grupo do ferro em soluções aquosas 9,10 . O metal tungstênio e suas ligas são utilizados em situações que necessitam de altas temperaturas. O tungstênio apresenta as seguintes propriedades: alta resistência à corrosão, dureza, mesmo em temperaturas elevadas, baixo coeficiente de dilatação, alta condutividade térmica, além de não ser atacado por nenhum ácido mineral à temperatura ambiente 11 e forma ligas duras com o cobalto, retendo algumas de suas propriedades incomuns 1 . O planejamento fatorial experimental apresenta muitas vantagens sobre os métodos univa...

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Section: Composição E Aparência Do Depósitounclassified

Otimização do banho eletrolítico da liga Fe-W-B resistente à corrosão

Santana¹,

Campos²,

Prasad³

et al. 2007

Quím. Nova

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“…The existing preparation methods of FeWB [18][19][20][21] can hardly be realized in industrial production because of their high cost of raw materials, high requirements on equipment and unfriendliness to environment, i.e. their production process is not satisfactory.…”

Section: Introductionmentioning

confidence: 99%

Study on the synthesis behavior of Fe–W–B powders and the preparation of bulk

et al. 2015

Advanced Powder Technology

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“…Many amorphous alloys, such as Fe-based amorphous alloys, possess superior magnetic properties compared to their crystalline counterparts because of their unique atomic structures [ 1 ]. A great deal of effort has been devoted to iron series alloy nanoparticles because of the novel optical, catalytic, electrical, and magnetic properties [ 2 – 8 ]. Generally, the preparation methods of the nanoalloys have strict environment requirement or complicated experiment process because of the strong activity of the fresh metal nanoparticles [ 9 – 12 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Soft Magnetic Fe‐Ni‐Pb‐B Alloy Nanoparticles by Room Temperature Solid‐Solid Reaction

Zhong

2013

The Scientific World Journal

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The Fe-Ni-Pb-B alloy nanoparticles was prepared by a solid-solid chemical reaction of ferric trichloride, nickel chloride, lead acetate, and potassium borohydride powders at room temperature. The research results of the ICP and thermal analysis indicate that the resultants are composed of iron, nickel, lead, boron, and PVP, and the component of the alloy is connected with the mole ratio of potassium borohydride and the metal salts. The TEM images show that the resultants are ultrafine and spherical particles, and the particle size is about a diameter of 25 nm. The largest saturation magnetization value of the 21.18 emu g−1 is obtained in the Fe-Ni-Pb-B alloy. The mechanism of the preparation reaction for the Fe-Ni-Pb-B multicomponent alloys is discussed.

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Preparation and thermal properties of amorphous Fe–W–B alloy nano-powders

Cited by 14 publications

References 14 publications

Otimização do banho eletrolítico da liga Fe-W-B resistente à corrosão

Otimização do banho eletrolítico da liga Fe-W-B resistente à corrosão

Study on the synthesis behavior of Fe–W–B powders and the preparation of bulk

Preparation of Soft Magnetic Fe‐Ni‐Pb‐B Alloy Nanoparticles by Room Temperature Solid‐Solid Reaction

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