Investigation of the Effect of Welding Energy on the Electrochemical Corrosion Resistance of Self-Healed Stainless Steel 304H

Resnandya, Arrel Daffa (2026) Investigation of the Effect of Welding Energy on the Electrochemical Corrosion Resistance of Self-Healed Stainless Steel 304H. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Stainless steel 304H is commonly used in high-temperature industrial applications due to its good mechanical strength and corrosion resistance. However, welding can affect the heat affected zone and disturb the stability of the passive film, which may reduce corrosion resistance. Therefore, this study investigates the effect of welding energy on the corrosion resistance of self-healed SS304H and evaluates the possibility of re-healing the welded area through additional treatment. Several specimen conditions were prepared, including as-received, heat-treated, shot-peened, welded, and post-weld treated specimens. Shot peening was used to support the self-healing process, while welding was applied using two different currents, 50 A and 100 A. The corrosion behavior was evaluated using a mini-cell electrochemical setup and electrochemical testing. The results were analyzed based on the trend of the polarization curves, including current response, passive behavior, and trans-passive region. The results show that shot peening combined with 72-hour heat treatment affected the passive behavior of SS304H and was used as the self-healed condition before welding. Welding shifted the polarization curves toward higher current response, indicating a reduction in corrosion resistance, especially at higher welding current. Post-weld treatment showed a recovery tendency, particularly when additional shot peening was followed by 72-hour heat treatment. Overall, this study indicates that welding energy affects the corrosion resistance of self-healed SS304H, while post-weld peening and heat treatment have potential to partially restore the corrosion behavior of the welded area.
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Stainless steel 304H banyak digunakan pada aplikasi industri bersuhu tinggi karena memiliki kekuatan mekanik dan ketahanan korosi yang baik. Namun, proses pengelasan dapat memengaruhi daerah terdampak panas (heat-affected zone atau HAZ) serta mengganggu kestabilan lapisan pasif, sehingga berpotensi menurunkan ketahanan korosi material. Oleh karena itu, penelitian ini bertujuan untuk menginvestigasi pengaruh energi pengelasan terhadap ketahanan korosi Stainless Steel 304H yang telah mengalami self-healing, serta mengevaluasi kemungkinan pemulihan kembali daerah las melalui perlakuan tambahan. Beberapa kondisi spesimen dipersiapkan, yaitu as-received, heat-treated, shot-peened, welded, dan spesimen yang memperoleh perlakuan pasca-pengelasan. Shot peening digunakan untuk mendukung proses self-healing, sedangkan proses pengelasan dilakukan menggunakan dua variasi arus, yaitu 50 A dan 100 A. Perilaku korosi dievaluasi menggunakan sistem elektrokimia mini-cell melalui pengujian elektrokimia. Hasil pengujian dianalisis berdasarkan kecenderungan kurva polarisasi, meliputi respons arus, perilaku pasivasi, dan daerah transpasif. Hasil penelitian menunjukkan bahwa shot peening yang dikombinasikan dengan perlakuan panas selama 72 jam memengaruhi perilaku pasivasi Stainless Steel 304H dan digunakan sebagai kondisi self-healed sebelum proses pengelasan. Pengelasan menyebabkan kurva polarisasi bergeser menuju respons arus yang lebih tinggi, yang mengindikasikan penurunan ketahanan korosi, terutama pada penggunaan arus pengelasan yang lebih tinggi. Perlakuan pasca-pengelasan menunjukkan kecenderungan pemulihan ketahanan korosi, khususnya pada spesimen yang diberi perlakuan shot peening tambahan kemudian dilanjutkan dengan perlakuan panas selama 72 jam. Secara keseluruhan, penelitian ini menunjukkan bahwa energi pengelasan memengaruhi ketahanan korosi Stainless Steel 304H yang telah mengalami self-healing, sedangkan kombinasi shot peening dan perlakuan panas pasca-pengelasan berpotensi memulihkan sebagian perilaku korosi pada daerah hasil pengelasan.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Corrosion Resistance, Electrochemical Testing, Mini-cell, Self-healing, Welding Energy, Energi Pengelasan, Ketahanan Korosi, Mini-cell, Pengujian Elektrokimia, Self healing.
Subjects:	T Technology > TN Mining engineering. Metallurgy > TN690 Metallography. Physical metallurgy T Technology > TN Mining engineering. Metallurgy > TN752.I5 Steel--Heat treatment T Technology > TN Mining engineering. Metallurgy > TN879.6 Welding T Technology > TS Manufactures > TS174 Maintainability (Engineering) . Reliability (Engineering)
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Arrel Daffa Resnandya
Date Deposited:	06 Aug 2026 02:01
Last Modified:	06 Aug 2026 02:01
URI:	http://repository.its.ac.id/id/eprint/144122

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