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Alloying hot galvanizing plating coat analysis method

An analysis method, hot-dip galvanizing technology, applied in the direction of testing metals, material inspection products, etc., can solve problems such as difficulty in separation, large analysis errors, and influence

Inactive Publication Date: 2004-09-01
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low strength, it is easily affected by the background and side peaks and the bottom of the coating texture, and the analysis error is large
Moreover, the surface of the sample is required to be stress-free, the test cost is high, and the Γ1 and Γ phases are difficult to separate, so it is often used to compare the relative quantities of different samples

Method used

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  • Alloying hot galvanizing plating coat analysis method
  • Alloying hot galvanizing plating coat analysis method
  • Alloying hot galvanizing plating coat analysis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Take sample 1 and analyze according to the following analysis method

[0067] (1) Preparation of coating metallographic samples

[0068] a. Sample mounting: first cut sample 1 into large pieces of 10×20mm, and cold mount with epoxy resin;

[0069] b. Sample cutting: After the above-mentioned metallographic sample after cold mounting is solidified, it is cut off from the middle at a slow speed with a grinding wheel;

[0070] c. Grinding and polishing: grind and polish the metallographic sample cut above, and rinse with alcohol during polishing. The sandpaper is from coarse to fine. Rinse and dry with alcohol every time you change the sandpaper to avoid contamination of the coating. rinse with alcohol;

[0071] d. Etching: After the metallographic sample rinsed with alcohol is dried, it is etched with an etchant, and the etchant is 0.5% nitric acid alcohol solution;

[0072] Through the above steps, the clear and complete coating metallographic structure of sample 1 w...

Embodiment 2

[0081] Sample 2 was analyzed by the same analysis method as in Example 1.

[0082] The quantitative results of sample 2 are shown in Table 3 as normal alloying. The Fe% of the coating is 9.1%. The coating structure has a certain amount of ζ phase and δ, Γ1, and Γ phase on the surface. The electron microscope scanning morphology of the coating is shown in the figure 6(b)(c). Its polarization curve is shown in Fig. 6(a).

Embodiment 3

[0084] Sample 3 was analyzed by the same analysis method as in Example 1.

[0085] The quantitative results of sample 3 are shown in Table 3. It is overalloyed, and the Fe% of the coating is 12.7%. There is no ζ phase in the coating structure, and it mainly consists of δ, Γ1, and Γ phases. The electron microscope scanning morphology of the coating is As shown in Figure 7(b)(c). Its polarization curve is shown in Fig. 7(a)

[0086] Table 3 quantitative calculation results (%)

[0087] Alloy Phase Name Sample 1 Sample 2 Sample 3

[0088] η 22

[0089] ζ 66(ζ+δ) 34

[0090] δ+Γ1 4(Γ1) 56 91

[0091] Γ 8 9 9

[0092] By adopting the analysis method of the invention, a complete, real and clear alloyed hot-dip galvanized coating structure can be obtained. Due to the low enough potential scanning speed, each phase of the coating can be dissolved phase by phase, and the dissolution process of each phase can be distinguished.

[0093] According to the polarization...

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PUM

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Abstract

The invention provides a method of analyzing hot-dip galvannealed coating, including: use epoxy resin for cold inserting, cutting sample, milling sample, finishing, alcoholizing and use nitric acid mixed solution for etching to obtain a gold-phase sample of the coating, use sodium chloride and white vitriol as electrolyte, adopts constant potential method to determine the texture chart and polarization curve of the coating of the obtained sample, to make qualitative and quantitative analysis on the coating, not only achieving a complete, real and clear texture of the hot-dip galvannealed coating but also effectively and really making qualitative and quantitative analysis on the hot-dip galvannealed coating.

Description

technical field [0001] The invention relates to an analysis method of a coating structure, in particular to an analysis method of an alloyed hot-dip galvanized coating. Background technique [0002] Alloyed galvanized sheet emerged in the 1980s. It is to heat the steel sheet after hot-dip galvanizing, keep it warm for a certain period of time, and form a zinc-iron alloy layer through the mutual diffusion of iron in the substrate and zinc in the coating. The coating structure may consist of η (pure zinc), ζ (FeZn13), δ (FeZn7), Γ (Fe5Zn2) and Γ1 phases from the surface to the inside. The coating has good corrosion resistance, paintability and spot weldability. As a new type of automobile outer panel, it is favored by automobile manufacturers and has broad application prospects. [0003] Due to the complexity of the coating structure, the analysis of the coating structure is still a hot spot in the study of the relationship between the coating structure, process and performan...

Claims

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Application Information

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IPC IPC(8): G01N33/20
Inventor 张红袁明生程国平
Owner BAOSHAN IRON & STEEL CO LTD
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