Pengaruh Welding Energy Terhadap Ketahanan Korosi Self-Healed Stainless Steel 304H

Maharani, Amalia Yasmine (2026) Pengaruh Welding Energy Terhadap Ketahanan Korosi Self-Healed Stainless Steel 304H. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Austenitic stainless steel 304H (SS304H) secara ekstensif digunakan dalam industri manufaktur untuk aplikasi bersuhu tinggi karena kekuatan mekanis dan ketahanan korosinya yang unggul. Namun, siklus termal selama proses pengelasan sering kali mendegradasi area yang terkena paparan panas (heat-affected zone), mengganggu stabilitas lapisan pasif pelindung, dan menurunkan ketahanan korosi material. Untuk mengatasi tantangan ini, penelitian ini mengkaji pengaruh variasi energi pengelasan terhadap ketahanan korosi pada SS304H self-healed sekaligus mengeksplorasi sebuah inovasi spesifik dalam perlakuan pasca-las (post-weld treatment) guna memulihkan integritas strukturnya. Metodologi eksperimental dilakukan dengan mengevaluasi beberapa kondisi spesimen: as-received, heat-treated, shot-peened, welded, dan post-weld treated. Kombinasi shot peening dengan perlakuan panas (heat treatment) selama 72 jam diterapkan untuk mempercepat proses self-healing sebelum pengelasan. Selanjutnya, proses pengelasan dilakukan menggunakan dua variasi arus yang berbeda, yaitu 50 A dan 100 A. Perilaku korosi lokal dievaluasi secara kuantitatif menggunakan metode pengaturan elektrokimia sel mini (mini-cell) melalui pengujian polarisasi potensiodinamik. Analisis terhadap kurva polarisasi—dengan fokus pada respons arus, perilaku pasif, dan wilayah transpasif—mengungkapkan bahwa pengelasan menggeser kurva menuju respons arus yang lebih tinggi. Hal ini mengindikasikan penurunan ketahanan korosi yang signifikan, yang mana efeknya menjadi jauh lebih parah pada penggunaan arus pengelasan yang lebih tinggi. Secara krusial, perlakuan pasca-las menunjukkan kecenderungan pemulihan yang sangat baik; secara spesifik, penerapan shot peening tambahan yang diikuti dengan perlakuan panas 72 jam terbukti efektif merestorasi lapisan pasif material. Pada akhirnya, penelitian ini mengonfirmasi bahwa meskipun besaran energi pengelasan berdampak substansial terhadap penurunan ketahanan korosi SS304H self-healed, intervensi pasca-las yang strategis dapat memulihkan kembali sifat pelindung material tersebut hingga mendekati kondisi semula.

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Austenitic stainless steel 304H (SS304H) is extensively utilized in the manufacturing industry for high-temperature applications due to its superior mechanical strength and corrosion resistance. However, thermal cycles during welding often degrade the heat-affected zone, disrupting the stability of the protective passive film and reducing corrosion resistance. To address this challenge, this study investigates the effect of varying welding energy on the corrosion resistance of self-healed SS304H and explores a specific innovation in post-weld treatments to recover its structural integrity. The experimental methodology involved evaluating several specimen conditions: as-received, heat-treated, shot-peened, welded, and post-weld treated. Shot peening combined with a 72-hour heat treatment was employed to accelerate the self-healing process prior to welding. Subsequently, welding was applied using two different currents, 50 A and 100 A. Localized corrosion behavior was quantitatively assessed using a mini-cell electrochemical setup through potentiodynamic polarization testing. The analysis of polarization curves—focusing on current response, passive behavior, and the transpassive region—revealed that welding shifted the curves toward higher current responses. This indicates a marked reduction in corrosion resistance, which was notably more severe at the higher welding current. Crucially, post-weld treatments demonstrated a strong recovery tendency; specifically, the application of additional shot peening followed by a 72-hour heat treatment effectively restored the passive film. Ultimately, this research confirms that while welding energy substantially impacts the corrosion resistance of self-healed SS304H, strategic post-weld interventions can successfully restore its protective properties.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Energi Pengelasan, Inovasi, Industri Manufaktur, Ketahanan Korosi, Pengujian Elektrokimia, Self-Healing, SS304H
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA418.75 Corrosion-resistant materials
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Physics Engineering > 30201-(S1) Undergraduate Thesis
Depositing User:	Amalia Yasmine Maharani
Date Deposited:	15 Sep 2026 03:00
Last Modified:	15 Sep 2026 03:00
URI:	http://repository.its.ac.id/id/eprint/144086

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