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Journal : Metalurgi

Self-Healing Behavior of Hydrothermally Engineered HAp/PAA Coatings on Magnesium Alloy WE43 Erryani, Aprilia; Rokhmanto, Fendy; Setyawan, Albertus Deny Heri; Thaha, Yudi Nugraha; Zakiyuddin, Ahmad; Kartika, Ika; Harjanto, Sri
Metalurgi Vol 39, No 3 (2024): Metalurgi Vol. 39 No. 3 2024
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/metalurgi.2024.780

Abstract

This work examines the self-healing properties and corrosion prevention mechanisms of hydrothermally synthesized HAp/PAA (hydroxyapatite/polyacrylic acid) composite coatings on magnesium alloy WE43. The coatings were produced with different PAA concentrations (0.15, 0.3, and 0.5 wt.%) by a hydrothermal method at 140 °C for 3 hours. The composite layers were analyzed using FTIR (fourier transform infrared spectroscopy), SEM (scanning electron microscopy), and EIS (electrochemical impedance spectroscopy) to assess their structural and electrochemical properties, as well as their self-healing capabilities via a scratch–immersion test in Hank’s solution at 37 °C for 48 hours. FTIR analysis confirmed the simultaneous presence of HAp and PAA phases without any chemical reaction, indicating physical contact through hydrogen bonding. The elevation of PAA concentration markedly affected coating morphology, resulting in denser and more uniform structures characterized by spherical HAp crystals at 0.5 wt.% PAA. SEM analysis following scratching and immersion demonstrated that the 0.5 wt.% PAA coating successfully preserved surface integrity and displayed partial restoration of the injured region via the reprecipitation of Ca–P compounds. The EIS findings indicated that the 0.5 wt.% PAA coating maintained the maximum impedance modulus (>10⁴ Ω·cm²) and a steady phase angle after 48 hours of immersion, therefore affirming its exceptional corrosion resistance and self-healing properties. The results demonstrate that an ideal PAA content fosters a dense, ion-responsive hybrid layer that effectively reinstates barrier characteristics following mechanical impairment. The hydrothermally produced 0.5 wt.% HAp/PAA coating offers an efficient self-healing and corrosion-resistant surface for WE43 magnesium alloy, indicating significant potential for use in next-generation biodegradable implant systems.
Corrosion Behavior of Equiatomic Bio-High Entropy Alloys CoCrMoMnNb Fabricated in Multiple Remelting Processes Rokhmanto, Fendy; Erryani, Aprilia; Setyawan, Albertus Deny Heri; Thaha, Yudi Nugraha; Zakiyuddin, Ahmad; Kartika, Ika; Harjanto, Sri
Metalurgi Vol 39, No 3 (2024): Metalurgi Vol. 39 No. 3 2024
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/metalurgi.2024.782

Abstract

High-entropy alloys are described as equiatomic alloys of more than five elements or materials with five or more element constituents with a high mixing entropy (ΔSmix ≥ 1.5R), where the composition of the element is 5–35%, respectively. One application of HEA (high entropy alloys) materials is in the orthopedic field, where they are developed as biomaterials. Behavior, the correlation between the elemental distribution, and the microstructure of the material were investigated during multiple remelting processes known as Bio-HEAs. The development of Bio-HEAs is exciting in terms of design material, fabrication, and their properties. In this paper, the corrosion behavior and the correlation of the elemental distribution and the microstructure of the material were investigated during the multiple remelting process. The equiatomic CoCrMoMnNb was prepared in vacuum arc melting under an argon atmosphere and melted in a water-cooled copper mold. The total amount of ingot was approximately 25 grams, then flipped and remelted several times, 4, 8, and 12 cycles. The final composition of the alloys was confirmed by EDX (energy dispersive x-ray spectroscopy). The microstructure was investigated with an optical microscope and the SEM (scanning electron microscope). The corrosion parameter occurred in Hank’s solution at 37°C, at a scan rate of 1 mV/s. The CCM-MnNb fabricated with 8 cycles of the remelting process exhibits the lowest corrosion rate (0.0038 mmpy) and donor densities (2.67 × 10¹⁹ cm⁻³), while the charge transfer resistance number is the highest (18250.94 Ω cm⁻²). The outstanding corrosion resistance of the alloys is induced by the presence of the finer dendrites and the chromium oxide (Cr₂O₃) protective layer on the alloy's surface.
Co-Authors Abdul Aziz, Haris Abdul Gofur, Huliman Abdulloh, Parid Abriansyah, Faisal Ade Saputra Nasution Adhitya Trenggono, Adhitya Agustianty, Efit Fitria Ahmad Syauqi Hidayatullah Ahmad Zakiyuddin Ahyudin, Didin Aji Budi Santosa Aji Santoso Akbari, Safitri Al Akbar, Amin alfira, alfira Alfirano, Alfirano Ali Alhamidi, Ali Alimuddin Amal, M Ikhlasul Amara, Itaqila Amelia, Rahma Amroni, Amroni Andarista, Aria Ani Widyawati, Ani Anindya, Weni Annur, Dhyah Anugrah, Pria Arifin, Antoni Ludfi Arifudin, Opan Arjadisastra, Nasihin Arman Paramansyah Aroyandini, Elvara Norma Arum Widyarini Ashari, Andi Mulya Astawa, I Nyoman Gede Putrayasa Atika, Iva Nandya Aulia, Frida Aulia, Maulida Ayu Lestari, Ni Wayan Fitriana Bagaskara, Muhammad Zaki Baihaqi, Muhammad Hafidz Bambang Soegijono Budi Riza Putra Bumbungan, Sepriadi Cahya Sutowo Chaerunnisa Cholimah, Vina Nur Citra Dewi Corry Yohana Darmawan, Diky Desmaradd, Soraya Sagita Desmeradd, Soraya Sagita Devi Safitri Deviah, Siti Rahmada Devita Devita Dewi Susita Dewi, Dessy Kumala Dwi Kartika, Viar Dwijaya, Made Subekti Efrita Norman ekawati Elyas Djufri Erfiyana, Evi Erial Bahar, Erial Erryani, Aprilia Erryani, Aprilia Fabianza, Iqbal Fajrul Hamdi Barmawi Farel Sopaheluwakan, Indy Fariza, Muthia Fatimah Dzakiroh Fauzan Ginanjar, Taufiq Fauziah, Nyiayu Febriyani, Ayu Fernanda, Tiara Firdaus, Risky Fitri Meliani, Fitri Fitri, Eka Fitria, Zahra Gitama, Gytha Nurhana Dhea Praadha HAMIDAH Handayani, Dina Hania Aminah, Hania Hardivan, Hardivan Helina, Erna Herlina Heni Maulani, Heni Heni Susanti Herawati, Silvi Herliawati, Lia Hidayat, Gugum Agung Hidayat, Rohman Hidin Muhidin Himawan Putranta Humairo, Shovi Sholahiyah Ibrahim Ibrahim Ibrahim Purawiardi, Ibrahim Ijirana Ika Kartika Indriani, Noer Puspita Ivon Bilkistan Iwan Setiawan Jamilah, Vita Jayanti, Sri Joko Purwanto Julhida, Fajar Julhida, M Fajar Junaedi Junaedi Karlina, Haura Kosasih, Muhamad Krisna Murti Kuswandi, Sony Kuswandi, Stefanus Laili Fitri Yeni Laily Purnamasari, Dewi Latifah, Alia Leman, Swanggi Lena Magdalena, Lena Lestari, Franciska P. Lestari, Franciska Pramudji Lestari, Franciska Pramuji Lestari, Franciska Pramuji Libel, Eduwardo Lubis, Dokmen M Jahidin M. Rafi Machmud Maghfiroh, Adinda Haniatul Mahfud Baihaki Mahira, Sarah Makmudi, Makmudi Maria Ulfa Marvina, Vivien Masitho, Siti Maulana, Slamet Meri, Meri Mochammad Chaerul, Mochammad Muadi, Muadi Muh. Rizal Muhamad Fadli Muhammad Muhammad Firmansyah, Muhammad Mukmin Suprayogi, Mukmin Mulyati, Inti Mulyawan, Hafid Muna, Nailul Murdianti, Annisa Andrea Muslim Nanang Purnama, Radik Nasution, Annio Indah Lestari Natalia, Jessica Neti, Neti Nisa, Zakia Hary Noerlitasari Nopita Setiawati Noprianti, Vivin Nora Ramkita NOVITA SARI, PUTRI Nur Hajijah, Sitta Nurfitriah Nurhalim Nurhalim, Nurhalim Nurhana Dhea Parlina Nurhana Dhea Praadha Gitama, Gytha Nurhana, Gytha Nurita, Ita Nurita Nurkomala Dewi, Wiwiek Nurlita, Siti Oktavia, Bela Oktaviana, Alysa Paddy, Paddy Parameswari Pramuwardhani, Andita Sri Permana, Ardian Agus Perme Suci, Dina Perwira, Ida Farida Adi Pitaloka, Bela Lola Pranata, Sudadi Purnamasari, Laelah Purwaningsih, Yuli Putri, Nadia Safira Ramdhani, Deni Ratu Asma Rd. Tuty Sariwulan Ridhova, Aga Rihma, Wildya Agna Rima Widia Riyanto Riyanto Rizki Hidayat, Muhammad Rochmad Novian Inderanata Rokhmanto, Fendy Rokhmanto, Fendy Ropitasari, Anna Rosdiana, Nanin Rusminan, Suly Auline Sadiah, Ati Saepudin Saepudin Saepudin Sahar Layali, Sahar Saidah, Chaira Sandria, Sandria Sapitri, Elsa Saputra, Ade Maulana Saputra, Brama A. Saputri, Rahmawati Eka Sari, Pratia Mega Sarintan Nurcahyati Kaharu Seda, Andi Septa, Fadly Setiawati, Yanti Hasbian Setyawan, Albertus Deny Heri Sih Hayuning Tyas Hestutami SIHOTANG, DONI SUGIANTO Siti Fatimah SITI MARYAM Siti Masitho Sitohang, Lita Meliana Sitorus, Lyandra S Sri Hardianti Sartika, Sri Hardianti Sri Harjanto Sri Muliani, Sri Sri Yanih Srihartini, Yusi Sriyono, Bambang Steven Steven Sugianto, darul Suhada, Ahmad Suhenda, Suhenda Suherman, Kevin Andreas Sukarso, Sulistyoso Gian Sulastri Sulastri Sunasa, Arman Aria Supriadi, Ujang Supriani, Yuli Supriatna, Usup Suryapranatha, Dicky Suwandi Suwandi Suzena, Yayuk Syamswisna , Syuwari, Hanifah Ridho T, Yudi Nugraha Taufika Rahmah, Alifia Tendi, Grace Regina Thaha, Yudi Nugraha Tjahja, Stephanus Rainer Tri Sumarsih Triantika, Nova Trisnawati, Nia Turini, Turini Ucu, Nurjanah Umar Mone Umi Widyastuti Umronih, Dewi Usep Suhud Uswatiyah, Wiwi Wahyu Ningsih, Indah Wahyudi, Titono Wibowo, Esa Hari Widyasari, Friscandany Dhiaz Wiwiek Nurkomala Dewi Wresnindyatsih Wresnindyatsih, Wresnindyatsih Wulan Tri Wahyuni Yahya, Irfan Yulianingsih, Elsa Yulistiani, Siti Alfiah Yuningsih, Andri Yuningsih, Neni Yunita, Rini Irma Yustina, Kristin Zikrulloh, Muhamad