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Journals / Sakarya University Journal of Science / 2026 / Volume: 25 Issue: 4

Corrosion Effects on Fatigue Behavior of Zn-Cr+3 and Zn Flake Coated M8 DIN 933 Bolts

Sezgin Yurtdaş(Norm Cıvata San. ve Tic. A.Ş.)0000-0002-4120-8882
Umut İnce(Norm Cıvata San. ve Tic. A.Ş.)0000-0002-3118-3060
Barış Tanrıkulu(Norm Cıvata San. ve Tic. A.Ş.)0000-0001-5441-0118
Cenk Kılıçaslan(Norm Cıvata San. ve Tic. A.Ş.)0000-0002-5787-9891
Muhammed Burak Toparlı(Norm Cıvata San. ve Tic. A.Ş.)0000-0002-5203-5171
Pages
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Publication Date
2021-08-30
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

For both coatings and corrosion conditions, fatigue cracks were seen to initiate from the thread roots.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:In this study, fatigue behavior of Zn-Cr+3 and zinc flake coated bolts was investigated experimentally by considering corrosion effects.
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Key Findings & Data:Fatigue tests were conducted on M8x50x1.25 8.8 DIN 933 bolts at normal and corroded conditions at force amplitudes between 2.35 and 5.36 kN at test frequency of 75 Hz.
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Conclusion & Impact:For both coatings and corrosion conditions, fatigue cracks were seen to initiate from the thread roots.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Bolt · fatigue life · coating

Abstract

In this study, fatigue behavior of Zn-Cr+3 and zinc flake coated bolts was investigated experimentally by considering corrosion effects. Fatigue tests were conducted on M8x50x1.25 8.8 DIN 933 bolts at normal and corroded conditions at force amplitudes between 2.35 and 5.36 kN at test frequency of 75 Hz. A part of bolts was subjected to salt atmosphere for corrosion. According to the Wöhler curves obtained from fatigue tests before corrosion, zinc flake coated bolts showed 1.55 times higher fatigue life compared to Zn-Cr+3. After corrosion, fatigue tests showed that the fatigue life difference increased to 2.10 times for the zinc flake coating. Moreover, corrosion was found to be ineffective on crack initiation region. For both coatings and corrosion conditions, fatigue cracks were seen to initiate from the thread roots.

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Cite This Article

Yurtdaş, S., İnce, U., Tanrıkulu, B., Kılıçaslan, C., Toparlı, M. B. (2021). Corrosion Effects on Fatigue Behavior of Zn-Cr+3 and Zn Flake Coated M8 DIN 933 Bolts. Sakarya University Journal of Science, Volume: 25 Issue: 4. https://doi.org/10.16984/saufenbilder.796745

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