Malaysian Journal of Analytical Sciences Vol 23 No 1 (2019): 155 - 169

DOI: 10.17576/mjas-2019-2301-19

 

 

 

EFFECT OF PULSED LASER ABLATION IN WATER ON THE CORROSION BEHAVIOUR AND SURFACE HARDNESS OF STAINLESS STEELS

 

(Kesan Ablasi Laser Gentian Denyut dalam Air terhadap Kakisan dan Kekerasan Permukaan Keluli Kalis Karat)

 

Sze Ney Chan¹, Wai Yin Wong²*, Walvekar Rashmi¹, Abdul Amir Hassan Kadhum^2,3,Mohammad Khalid⁴, Kean Long Lim²

 

¹School of Engineering,

Taylor’s University Lakeside Campus, Jalan Taylor’s, Subang Jaya, 47500, Selangor, Malaysia

²Fuel Cell Institute

³Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

⁴Graphene & Advanced 2D Materials Research Group (GAMRG),

Sunway University, No. 5, Jalan Universiti, Bandar Sunway, 47500 Subang Jaya, Selangor, Malaysia

 

^*Corresponding author:   waiyin.wong@ukm.edu.my, RashmiGangasa.Walvekar@taylors.edu.my

 

 

Received: 13 April 2017; Accepted: 17 April 2018

 

 

Abstract

This work presents the use of pulsed fibre laser ablation in water (PLAW) to study the corrosion behaviour and surface hardness of stainless steels. A stainless-steel plate was ablated with a pulsed ytterbrium-doped fibre laser at a power of 4.2 W. The laser-ablated sample was subjected to corrosion testing using electrochemical impedance spectroscopy and potentiodynamic polarisation. The results correlated with surface morphology, X-ray diffraction profiles and Vicker’s hardness values. PLAW can enhance the corrosion resistance of stainless steels in both neutral and acidic electrolytes. The corrosion potential of the laser-treated samples was more positive at −126 and −423 mV compared with that of the as-received samples at −209 and −439 mV in neutral and acidic electrolytes, respectively. The inhibition efficiencies of the laser-treated samples in neutral and acidic electrolytes were 98% and 52%, respectively. An improvement in the surface microhardness at a maximum of 8.7% was reported on the fibre laser-ablated stainless steels, thereby demonstrating the efficiency of fibre-laser-assisted PLAW in inhibiting corrosion and improving the hardness of stainless steel.

 

Keywords:  stainless steel, corrosion inhibition, fibre laser, pulse laser ablation in water

 

Abstrak

Kajian ini bertujuan untuk mengkaji kesan penggunaan teknik ablasi laser gentian denyut dalam air terhadap kakisan dan kekerasan permukaan keluli kalis karat. Dalam kajian ini, plat keluli kalis karat telah diablasi dengan laser gentian denyutan terdop ytterbrium pada kuasa 4.2 W. Seterusnya, plat sampel ini dikaji terhadap kakisan dengan teknik spektroskopi impedans elektrokimia dan polarisasi potentiodinamik. Kajian terhadap morfologi permukaan, profil sinar-X dan kekerasan Viker juga dilakukan. Kajian menunjukkan bahawa teknik ini dapat mempertingkatkan rintangan kakisan keluli kalis karat dalam elektrolit neutral dan asid. Potensi kakisan yang lebih positif diperolehi pada sampel terablasi laser gentian, iaitu pada -126 mV dan -423 mV berbanding dengan sampel kawalan (-209 mV dan -439 mV), masing-masing dalam elektrolit neutral dan asid. Kecekapan perencatan kakisan pada sampel terablasi adalah 98% dalam elektrolit neutral dan 24% dalam elektrolit asid. Sebanyak 8.7% pembaikan dari segi kekerasan mikro pada permukaan sampel terablasi dicapai. Hasil kajian ini berjaya menunjukkan kelebihan penggunaan laser gentian dalam proses ablasi keluli kalis karat dalam meningkatkan ketahanan kakisan dan kekerasan permukaan.

 

Kata kunci:  keluli kalis karat, kecekapan perencatan kakisan, laser gentian, ablasi laser denyut dalam air

 

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