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 R_p and R_wp 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.

通过渗碳获得的锌涂层由三个富锌的Fe-Zn相（γ，δ和ζ）组成，并且涂层的性能受三相含量的影响。涂层的定量相分析通常通过金相方法表征。因为此方法是一种破坏性测试。因此需要一种非破坏性的测试方法来量化锌涂层。X射线衍射结合Rietveld方法被用于量化它们在锌涂层中的比例。通过GSAS软件对在360°C和375°C下热处理2 h的渗碳涂层进行定量相分析。结果表明，R _p和R _wp的值低于5％。Rietveld方法获得的定量结果与实验值几乎一致，误差小于8.2％。为了提高定量细化的成功率，通过烧结工艺分别成功制备了γ，δ和ζ相，并通过Rietveld方法细化了它们的结构模型。所获得的晶体学参数用作涂层定量精制的初始结构模型。