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Rietveld-Based Quantitative Phase Analysis of Sherardizing Coatings

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Abstract

The zinc coatings obtained by sherardizing consist of three zinc-rich Fe–Zn phases (γ, δ and ζ) and the properties of coatings are influenced by the contents of three phases. The quantitative phase analysis of coatings is generally characterized by the metallographic method. Because this method is a destructive testing. So a nondestructive testing method is required to quantify the zinc coating. X-ray diffraction in combination with the Rietveld method was used to quantify their proportion in the zinc coatings. The quantitative phase analysis of sherardizing coatings under heat treatment of 360 °C and 375 °C for 2 h was carried out by GSAS software. The results show that the values of Rp and Rwp are below 5%. The quantitative results obtained by the Rietveld method are almost consistent with the experimental values, and the errors are less than 8.2%. In order to improve the success rate of quantitative refinement, the γ, δ and ζ phases were successfully prepared separately by the sintering process and their structural models were refined by the Rietveld method. The acquired crystallographic parameters were used as the initial structural model for quantitative refinement of coatings.

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Acknowledgement

The financial support from the National Natural Science Foundation of China (Grant No. 51971189) is acknowledged.

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Authors and Affiliations

  1. School of Materials Science and Engineering, **angtan University, **angtan, 411100, China

    Yuncong Zhong, **aobo Li & Junbi Long

  2. Key Laboratory of Materials Design and Preparation Technology of Hunan Province, **angtan, 411100, China

    **aobo Li

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  1. Yuncong Zhong
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  2. **aobo Li
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  3. Junbi Long
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Correspondence to **aobo Li.

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Zhong, Y., Li, X. & Long, J. Rietveld-Based Quantitative Phase Analysis of Sherardizing Coatings. Trans Indian Inst Met 73, 2947–2954 (2020). https://doi.org/10.1007/s12666-020-02079-4

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