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The Formation Mechanism of Sweat Phosphide in a New Form and Comparison with Expansion Scab in the Gray Cast Iron Castings

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Abstract

The present study compares the formation mechanism of two common defects in gray iron castings, sweat phosphide in a new form and expansion scab. Normally, when a solid crust occurs on the surface of gray iron castings, it is called “a scab.” In this study, we compared these two defects by means of standard metallography procedure and scanning electron microscopy. The result indicates that a scab caused by sand expansion is accompanied by sand particles beneath the solid crust and its microstructure is identical with the casting, while there are no sand particles beneath the sweat phosphide and its microstructure differs from casting.

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Acknowledgments

This work was financially supported by the Asia Pearlite Casting Industries Co (API Casting).

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Authors and Affiliations

  1. Asia Pearlite Casting Industries Co (API Casting), Amir Kabir Sq., Kaveh Ind. City, Saveh, 39145-331, Iran

    Amir Mohammad Sedigh Noohi, Naser Hamidnezhad, Azim Safikhani, Mohammad Reza Ghorbani Nia & Alireza Modaresi

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  1. Amir Mohammad Sedigh Noohi
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  2. Naser Hamidnezhad
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  3. Azim Safikhani
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  4. Mohammad Reza Ghorbani Nia
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  5. Alireza Modaresi
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Correspondence to Azim Safikhani.

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Noohi, A.M.S., Hamidnezhad, N., Safikhani, A. et al. The Formation Mechanism of Sweat Phosphide in a New Form and Comparison with Expansion Scab in the Gray Cast Iron Castings. Inter Metalcast 11, 347–355 (2017). https://doi.org/10.1007/s40962-016-0064-0

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  • DOI: https://doi.org/10.1007/s40962-016-0064-0

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