Elektrolitik Sert Metal Kaplamaya Alternatif Çevreye Duyarlı Ni-P Kaplamaların 6061 Serisi Alüminyum Altlık Üzerine Akımsız Yöntemle Biriktirilmesinde Sodyum hipofosfit, Sıcaklık ve Zamanın Etkisi

Abstract

Elektrolitik kaplamalara alternatif oluşturan ve dışarıdan herhangi bir elektrik ihtiyacına gerek duymadan gerçekleşen otokatalitik akımsız kaplamalar birçok endüstriyel alanda kullanılmaktadır. Homojen bir kaplama kalınlığı elde edilmesi, yüksek sertlik, iyi korozyon ve aşınma direncine sahip olması, akımsız kaplamaları oldukça yaygın hale getirmektedir. Ayrıca karmaşık şekilli parçalara da uygulanabilmesi avantajları arasında yer almaktadır. Bu çalışmada akımsız Ni-P kaplamaların sertlik, metalik nikel ve fosfor içerikleri, ısıl işlem sonrası oluşan bileşik türleri ve mikroyapısal özellikleri incelenerek sodyum hipofosfit, sıcaklık ve zaman parametrelerinin etkileri ortaya konmuştur.

Keywords

• Akımsız nikel kaplama,sodyum hipofosfit,sıcaklık,zaman

The Effect of Sodium Hypophosphite, Temperature and Time in co-deposit Ni-P ‎Coatings on 6061 Series Aluminum Substrate: An Environment-Friendly Alternative ‎to Electrolytic Hard Metal Coatings

Abstract

The autocatalytic electroless depositions, which form an alternative to the electrolytic deposition and do not require any external electrical power, are used in many industrial areas. Electroless nickel based plating has increased attention because of their high hardness, excellent corrosion, wear resistance very commonly. It also has the advantages of being applied to complex shaped parts. In this study, the hardness, metallic nickel and phosphorus contents of the electroless Ni-P coatings, the types of compounds formed after the heat treatment and their microstructural properties were investigated and the proporties of sodium hypophosphite, temperature and time parameters were examined. In addition Ni-P coatings, which are sensitive to environment and health, have been investigated a new alternative in the coating study carried out for 90 minutes to 950 HV. In addition, homogeneous Ni-P alloy coatings having a thickness of 20.6 microns depending on the reducing agent concentration and 10.9 microns depending on the coating time were obtained

Keywords

• Electroless nickel coating,sodium hydrophosphite,temperature,time

References

1. [1] R. C. Özden, “Sıcak Haddelenmiş AZ91 Magnezyum Alaşımı Üzerine Uygulanan Akımsız Ni-P-W Kaplamanın Korozyon ve Aşınma Özellikleri,” Eskişehir Osmangazi Üniversitesi, 2015.
2. ‎[2]‎ P. Sampath Kumar and P. Kesavan Nair, “Studies ‎on crystallization of electroless Ni-P deposits,” ‎J. Mater. Process. Technol., vol. 56, no. 1–4, pp. ‎‎511–520, 1996.‎
3. ‎[3]‎ D. Gökçe, “Akımsız Nikel Fosfor/nikel Bor ‎Dubleks Kaplamaların Korozyon Ve Aşınma ‎Dirençlerinin İncelenmesi,” İstanbul Teknik ‎Üniversitesi, 2012.‎
4. ‎[4]‎ J. Sudagar, J. Lian, and W. Sha, “Electroless ‎nickel, alloy, composite and nano coatings - A ‎critical review,” Journal of Alloys and ‎Compounds, vol. 571. pp. 183–204, 2013.‎
5. ‎[5]‎ A. I. Aydeniz, A. Göksenli, G. Dil, F. Muhaffel, C. ‎Calli, and B. Yüksel, “Electroless ni-b-w coatings ‎for improving hardness, wear and corrosion ‎resistance,” Mater. Tehnol., vol. 47, no. 6, pp. ‎‎803–806, 2013.‎
6. ‎[6]‎ S. K. Das and S. Prasamta, “A parametric ‎investigation of the friction performance of ‎electroless Ni-B coatings,” Lubr. Sci., vol. 23, pp. ‎‎81–97, 2011.‎
7. ‎[7]‎ K. N. Srinivasan, R. Meenakshi, A. Santhi, P. R. ‎Thangavelu, and S. John, “Studies on ‎development of electroless Ni–B bath for ‎corrosion resistance and wear resistance ‎applications,” Surf. Eng., vol. 26, no. 3, pp. 153–‎‎158, 2010.‎
8. ‎[8]‎ S. K. Das and P. Sahoo, “Tribological ‎characteristics of electroless Ni-B coating and ‎optimization of coating parameters using ‎Taguchi based grey relational analysis,” Mater. ‎Des., vol. 32, no. 4, pp. 2228–2238, 2011.‎

9. ‎[9]‎ P. G. Venkatakrishnan, S. S. Mohamed ‎Nazirudeen, and T. S. N. Sankara Narayanan, ‎‎“Formation and Structural Characterization of ‎Electroless Ni-B-P Ternary Alloy Coatings,” ‎Appl. Mech. Mater., vol. 592–594, pp. 385–390, ‎‎2014.‎
10. ‎[10]‎ A. Zarebidaki and S. R. Allahkaram, “Effect of ‎surfactant on the fabrication and ‎characterization of Ni-P-CNT composite ‎coatings,” J. Alloys Compd., vol. 509, no. 5, pp. ‎‎1836–1840, 2011.‎
11. ‎[11]‎ R. Taheri, “Evaluation of Electroless Nickel-‎Phosphorus ( EN ) Coatings,” PhD Thesis, no. ‎August 2002, p. 229, 2003.‎
12. ‎[12]‎ M. Czagány, P. Baumli, and G. Kaptay, “The ‎influence of the phosphorous content and heat ‎treatment on the nano-micro-structure, thickness ‎and micro-hardness of electroless Ni-P coatings ‎on steel,” Appl. Surf. Sci., vol. 423, pp. 160–169, ‎‎2017.‎
13. ‎[13] J. Novalovic, P. Vassilliou, K. Samara, T. ‎Argyropoulos, Electtoless NiP-TiO2 composite ‎coatings: Their production and properties, ‎Surface and Coatings Technology 201 (2006) ‎‎895-901.‎
14. ‎[14] R. Sun, G. Yu, Z. Xie, B. Hu, J. Zhang, X. He, X. ‎Zhang, Influence of hypophosphite on ‎efficiency and coating qualities of electroless Ni-‎P deposits on magnesium alloy AZ91D, Int. J. ‎Electrochem. Sci., 10 (2015) 7893 – 7904.‎
15. ‎[15] H. Sorkhabi Ashassi, S. H. Rafizadeh, Effect of ‎coating time and heat treatment on structures and ‎corrosion characteristics of electroless Ni–P ‎alloy deposits, Surface and Coatings Technology ‎‎176 (2004) 318–326.‎
16. ‎[16]‎ T. S. N. Sankara Narayanan, I. Baskaran, K. ‎Krishnaveni, and S. Parthiban, “Deposition of ‎electroless Ni-P graded coatings and evaluation ‎of their corrosion resistance,” Surf. Coatings ‎Technol., vol. 200, no. 11, pp. 3438–3445, 2006.‎
17. ‎[17]‎ M. Yan, H. G. Ying, and T. Y. Ma, “Improved ‎microhardness and wear resistance of the as-‎deposited electroless Ni-P coating,” Surf. ‎Coatings Technol., vol. 202, no. 24, pp. 5909–‎‎5913, 2008.‎
18. ‎[18]‎ M. Anik and G. Celikten, “Analysis of the ‎electrochemical reaction behavior of alloy AZ91 ‎by EIS technique in H3PO4/KOH buffered ‎K2SO4 solutions,” Corros. Sci., vol. 49, no. 4, ‎pp. 1878–1894, 2007. ‎