Effect of environmental changes on the corrosion behaviour of Al2O3/MA 956 system

Escudero, M.L.; García-Alonso, M. C.; Ruiz, José Luis; Loza, Hugo Canahua

doi:10.1002/1521-4176(200006)51:6<434::aid-maco434>3.0.co;2-s

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…But, high temperature oxide layers are often non-stoichiometric and disordered. Moreover, the good corrosion behaviour is not influenced by the physiological changes that continuously alter the environmental conditions within the body, such as pH and/or oxygen concentrations [9]. Thus, indepth study has been carried out in order to characterise the alumina layer/MA956 system [1, 3 ± 9].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the scale integrity in the Al2O3/MA956 system at different polarisation by using EIS

García‐Alonso

Escudero

González-Carrasco

2001

Materials and Corrosion

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In this work anodic polarisation test and electrochemical impedance spectroscopy (EIS) are combined to evaluate the integrity of the alumina layer generated “in situ” at high temperature (1100°C/3 h) on MA956 alloy. The SEM observations did not show the presence of voids or porosity in the alumina layer and a good adherence was revealed with the metallic substrate. The electrochemical response of the scale/metal system has been evaluated at different points of the anodic polarisation curve. In general, a polarisation applied to the sample, below the breakdown potential, did not affect the EIS results, irrespective of the polarisation withstood by the system. In other cases, besides the slightly higher current density measured during the anodic polarisation test, a decrease in the impedance modulus was observed. This behaviour could be related to the presence of microdefects in the scale, not visible by SEM, which become increasingly and/or connected during the polarisation test. The very low corrosion current densities in the passive region, about 10−9 A/cm2, and the high polarisation that the alumina layer withstands till breakdown occurs confirm the excellent corrosion protection provided by the scale. Once breakdown of the alumina layer occurs, a good repassivation of the system is observed due to the high chromium content of the alloy.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the scale integrity in the Al2O3/MA956 system at different polarisation by using EIS

García‐Alonso

Escudero

González-Carrasco

2001

Materials and Corrosion

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Determination of metallic traces in kidneys, livers, lungs and spleens of rats with metallic implants after a long implantation time

Rubio

García‐Alonso

Alonso

et al. 2007

J Mater Sci: Mater Med

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EFEK IMPLANTASI ION Mg DAN Y TERHADAP SIFAT KETAHANAN OKSIDASI MATERIAL MA 956

Sujitno¹,

Susita²,

Suprapto³

2013

gnd

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EFEK IMPLANTASI ION Mg DAN Y TERHADAP SIFAT KETAHANAN OKSIDASI MATERIAL MA 956. Dalam makalah ini disajikan hasil penelitian tentang pengaruh implantasi ion Magnesium dan Yttrium terhadap sifat ketahanan oksidasi material MA 956. Untuk maksud tersebut material MA 956 diimplantasi dengan ion Magnesium dan Yttrium pada doses Ion 1 x 1017 ion/cm2 dan pada energi 100 keV. Untuk mengetahui pengaruh sifat ketahanan oksidasinya, sampel dipanasi pada temperatur 1100 oC dalam udara yang mengandung oksigen selama 100 jam dengan menggunakan TGA (Thermogravitymetry). Disamping itu juga telah dilakukan analisa struktur mikro menggunakan SEM dan analisa komposisi kimia menggunakan EDX, dari pengujian yang telah dilakukan diperoleh hasil bahwa untuk benda uji yang tanpa diimplantasi, untuk benda uji yang diimplantasi dengan ion Magnesium dan dengan ion Yttrium dengan waktu oksidasi 100 jam, laju oksidasinya masing-masing sekitar 0.54 mg/cm2., 0,48 mg/cm2 dan 0,40 mg/cm2. Sedangkan dari analisa struktur mikro potongan melintang terlihat bahwa ketebalan lapisan oksida masing-masing adalah sekitar 0 67μm. 0,3μm dan 0,25μm. Dari hasil tersebut dapat disimpulkan bahwa dengan adanya implantasi elemen reakif Magnesium maupun Yttrium mampu menghambat laju oksidasi dari 0,54 mg/cm2 menjadi 0,48 mg/cm2 untuk material yang diimplantasi dengan ion Magnesium dan dari 0,54 mg/cm2, meyadi 0,40 mg/cm2 untuk materialyang diimplantasi dengan ion Yttrium.

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Effect of environmental changes on the corrosion behaviour of Al2O3/MA 956 system

Cited by 3 publications

References 7 publications

Evaluation of the scale integrity in the Al2O3/MA956 system at different polarisation by using EIS

Evaluation of the scale integrity in the Al2O3/MA956 system at different polarisation by using EIS

Determination of metallic traces in kidneys, livers, lungs and spleens of rats with metallic implants after a long implantation time

EFEK IMPLANTASI ION Mg DAN Y TERHADAP SIFAT KETAHANAN OKSIDASI MATERIAL MA 956

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