Gözenekli Malzemeler Üzerinde Elektro-Birikimli Krom-Nano Elmas Kompozit Kaplamanin Üç Farkli Korozyon Davrani-Şinin, Pasivasyonun, Çukurlaşmanin Ve Homojenliğin Deneysel Analizi

Öz

Nano ölçekli parçacıkların metal kaplamalarına dahil edilmesi, nano kompozit kaplamalar olarak bilinir ve artan sertlik, aşınma ve korozyon direncine sahip yeni bir malzeme şeklidir. Bu çalışmada, ön alaşımlı metal toz metalurji numuneleri, saf krom ve Cr-ND'nin (Krom-nano elmas) elektrolitik kaplamasına tabi tutulmuştur. Birlikte biriktirilen ND parçacıklarının krom kaplamaların pasivasyon, çukurlaşma ve üniform korozyon davranışı üzerindeki etkileri deneysel olarak incelenmiş ve saf krom kaplama ve kaplanmamış numunelerle karşılaştırılmıştır. Numunelerin korozyon davranışları, Polarizasyon Direnci, Dönüşümlü Voltametri ve Elektrokimyasal Empedans Spektroskopi ölçüm yöntemleri ile ağırlıkça %3,5 NaCl çözeltisinin altında analiz edilmiştir.. Ayrıca optik mikroskop, SEM (Taramalı Elektron Mikroskobu), EDS (Energy Dispersive X-Ray Spektroskopi), XRD (X-Ray Difraction) ve AFM (Atomic Force Microscope) kullanılarak karakterizasyon testleri gerçekleştirilmiştir. Elde edilen sonuçlara göre, saf krom kaplamalar ve kaplanmamış numunelerle karşılaştırıldığında, ND partiküllerinin krom matrisine dahil edilmesi nedeniyle Cr-ND kaplamaların korozyon davranışında ikna edici bir iyileşme elde edildiği gözlenmiştir.

Anahtar Kelimeler

• Nano elmas kompozit kaplama
• korozyon
• dönüşümlü polarizasyon
• Tafel ekstrapolasyonu
• elektrokimyasal empedans spektroskopi

An Experimental Evaluation of The Three Types of Corrosion, Passivation, Pitting, and Uniform Corrosion, by Electrodeposited Chromium-Nano Diamond Composite Coating on Porous Materials

Öz

Incorporation of nano scale particles in coatings of metals are known as nano composite coatings are a new form of materials with enhanced hardness, wear, and corrosion resistances. In this study, pre-alloy metal powder metallurgy specimens were subjected to electrolytic coating of pure chromium and Cr-ND (Chromium-nano diamond). The influences of the co-deposited ND particles on passivation, pitting and uniform corrosion behavior of the chromium coatings were experimentally inspected and compared with pure chromium coating and non-coated specimens. The corrosion behaviors of the samples were analyzed by Polarization Resistance, Cyclic Voltammetry and Electrochemical Impedance Spectroscopy measurement methods under 3.5 %wt. NaCl solution. Furthermore, characterization tests were carried out using an optical microscope, SEM (Scanning Electron Microscope), EDS (Energy Dispersive X-Ray Spectroscopy), XRD (X-Ray Diffraction) and AFM (Atomic Force Microscope). According to the obtained results, it was observed that as compared to pure chromium coatings and non-coated specimens, a convincing improvement in the corrosion behavior of the Cr-ND coatings was obtained because of the incorporation of the ND particles in the chromium matrix.

Anahtar Kelimeler

• Nano diamond composite coating
• corrosion
• cyclic polarization
• Tafel extrapolation
• electrochemical impedance spectroscopy

Kaynakça

1. [1] M. Etaat, M. Emamy, M. Ghambari, E. Fadaei: Surface treatment and nickel plating of iron powder metallurgy parts for corrosion protection, Materials and Design, 30 (2009) 3560–3565.
2. [2] Leisner P, Leu RC, Moller P.: Electroplating of porous PM compacts, Powder Metal, (1997) 40:207–10
3. [3] Gabe DR.: Corrosion protection of sintered metal parts, Powder Metal, (1977) 20:227–31.
4. [4] Abdel Aal A.: Hard and corrosion resistant nanocomposite coating for Al alloy, Material Science and Engineering A, (2008) 474:181-187.
5. [5] Gidikova N., Cias A., Petkov V., Madej M., Sułowski M., and Valov R.: Wear resistant chromium coatings modified with diamond nanoparticles, Archives of Metallurgy and Materials, 59 (4), (2014) 1513-1516.
6. [6] V. P. Isakov, A. I. Lyamkin, D. N. Nikitin, A. S. Shalimova, and A. V. Solntsev: Structure and Properties of Chromium–Nanodiamond Composite Electrochemical Coatings, ISSN 2070.2051, Protection of Metals and Physical Chemistry of Surfaces, (2010) Vol. 46, No. 5, pp. 578–581
7. [7] Juneghani M. A., Farzam M., and Zohdirad, H.: Wear and corrosion resistance and electroplating characteristics of electrodeposited Cr–SiC nanocomposite coatings, Transactions of Nonferrous Metals Society of China, 23 (7), 1993-2001, (2013).
8. [8] Yousefpour M. , Rahimi A.: Characterization and selection of optimal parameters to achieve the best tribological performance of the electrodeposited cr nanocomposite coating, Materials & Design, 54, 382- 389, (2014).

9. [9] Z. Zeng, L. Wang, A. Liang, J. Zhang: Tribological and electrochemical behavior of thick Cr–C alloy coatings electrodeposited in trivalent chromium bath as an alternative to conventional Cr coatings, Electrochim Acta 52 (2006) 1366–1373.
10. [10] Mandich, N. and Dennis, J.: Codeposition of nanodiamonds with chromium, Metal Finishing, 99 (6),117-119, (2001).
11. [11] P. Gyftou, E.A. Pavlatou, N. Spyrellis: Effect of pulse electrodeposition parameters on the properties of Ni/nano-SiC composites, Applied Surface Science, 254 (2008) 5910–5916.
12. [12] Hui Xu, Zhi Yanga, Meng-Ke Lia, Yan-Li Shia, Yi Huanga, Hu-Lin Li: Synthesis and properties of electroless Ni–P–Nanometer Diamond composite coatings, Surface & Coatings Technology, 191 (2005) 161–165.
13. [13] Macdonald J. R., Johnson W. B.: Theory in impedance spectroscopy [J]. New York: John Wiley & Sons, (1987).