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Sains Malaysiana 50(3)(2021):
849-858
http://doi.org/10.17576/jsm-2021-5003-25
Effect of Aging Heat Treatment on Corrosion Behavior and
Corrosion Kinetics of 17-4PH Stainless Steel in Artificial Saliva
(Kesan Rawatan Panas Penuaan terhadap Tingkah Laku Kakisan dan Kinetik Kakisan Keluli Tahan Karat 17-4PH dalam Air Liur Buatan)
ONTHIDA KOSASANG1,2*, MANUTCHAYA WONGKAEWMOON2 & SOMWAN CHUMPHONGPHAN1,2
1School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand
2Center of Innovative Materials for Sustainability (iMatS), School of Science, Mae Fah Luang Universit, Chiang Rai 57100, Thailand
Received: 11 June 2020/Accepted: 7 September 2020
ABSTRACT
The corrosion behavior of the sintered 17-4PH stainless
steel samples aged at different conditions in artificial saliva was studied
using the method of electrochemical and weight loss after exposure for various
periods of time. The results showed that the samples aged at 480 °C for 1 h
exhibited the highest corrosion resistance. The pitting corrosion was
predominantly initiated from existing, isolated
pores and further accelerated. The corrosion kinetics trend is found to
be more consistent with a bimodal function form rather than the classical
power-law function.
Keywords: 17-4PH stainless steel; artificial saliva;
corrosion behavior; corrosion kinetics
ABSTRAK
Sifat kakisan sampel keluli kalis karat 17-4PH dalam air liur tiruan telah dikaji menggunakan kaedah elektrokimia dan kehilangan berat selepas terdedah pada jangka masa yang berbeza.
Keputusan yang diperoleh menunjukkan bahawa sampel pada 480 °C selama 1 jam mempunyai rintangan kakisan tertinggi. Kakisan pempitan adalah dominan bermula daripada liang yang sedia ada dan terus dipercepatkan. Corak kinetik kakisan didapati lebih berpadan dengan fungsi bimodal berbanding dengan fungsi hukum-kuasa klasik.
Kata kunci: Air liur tiruan; keluli kalis karat 17-4PH; kinetik kakisan; sifat kakisan
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*Corresponding author; email:
onthida.kos@mfu.ac.th
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