Metallographic test method for identifying electro-galvanized and hot-galvanized steel products
A test method, hot-dip galvanizing technology, applied in the direction of testing metals, material inspection products, and preparation of test samples, etc., can solve the problems of different anti-corrosion protection capabilities, indistinguishable, poor gloss, etc., and achieve the effect of avoiding mutual confusion
Inactive Publication Date: 2019-07-26
南通市产品质量监督检验所
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Problems solved by technology
[0006] 1. The thickness is different, the electro-galvanized coating is thinner, and the hot-dip galvanized coating is thicker (much thicker);
[0007] 2. The appearance is different, the appearance of electro-galvanized is flat and bright, and the appearance of hot-dip galvanized is rough and glossy;
[0009] 4. The protection ability of anti-corrosion is different, and the protection ability of electro-galvanizing is not as strong as that of hot-dip galvanizing
Sometimes a hot-dip galvanized steel sheet and an electro-galvanized steel sheet are put together, and it is difficult to distinguish which is a hot-dip galvanized steel sheet and which is an electro-galvanized steel sheet
Therefore, it is currently impossible to distinguish the two by appearance.
Method used
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[0034] Instruments used in this example: ZEISS AXIO Scope A1m optical microscope of German Zeiss Company; German Zeiss EVO MA15 scanning electron microscope + Oxford Energy Spectrum Analyzer; Shanghai Optical Phase Sample Preparation Equipment Co., Ltd. PA-2 grinding and polishing machine and P-2 polishing machine.
[0035] In this example, 10 electro-galvanized and hot-dip galvanized steel products are selected, and 2 samples are taken for each type. The samples are intercepted by the cooling cutting method so that the detection surface is perpendicular to the covering layer, and then XQ-2B metallographic inlay is used. The sample is inlaid by the cold mounting method, and then ground and polished by the PA-2 grinding and polishing machine and the P-2 polishing machine in turn to obtain a cross-sectional metallographic sample.
[0036] Place the obtained cross-sectional metallographic sample under an optical microscope or an electron microscope, first observe at a low magnifi...
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The invention relates to a metallographic test method for identifying electro-galvanized and hot-galvanized steel products. The test method comprises the following steps: (1) intercepting a specimen of which the detection surface is vertical to a covering layer, then mounting the specimen by a cold mounting method, and performing grinding and polishing sequentially to obtain a prepared sample; (2)placing the prepared sample under an optical microscope or an electron microscope, firstly observing at low magnification, then gradually increasing the magnification factor, observing at high magnification, and performing energy spectrum analysis on a plating close to a substrate according to the GB / T 17359 standard by detecting the chemical composition of the plating through an energy dispersive spectrometer along with auxiliary analysis; and (3) judging that a steel product is a hot-galvanized steel product if a two-layer structure can be clearly observed from the section and a clear zinc-iron alloy layer exists at the junction of the plating and the substrate, or judging that the steel product is an electro-galvanized steel product if a one-layer structure is observed. Through adoption of the method disclosed by the invention, mix-up of galvanized steel products on the market and the behavior of selling seconds at best quality prices can be effectively avoided so as to standardizethe market.
Description
technical field [0001] The invention belongs to the technical field of component identification of steel products, in particular to a test method for electrogalvanizing and hot-dip galvanizing of steel products identified by metallography. Background technique [0002] Plates, strips, wires, pipes and other profiles widely used in the market can greatly improve their corrosion resistance and prolong their service life after being galvanized. Some companies choose steel gratings, gratings, and steel gratings for construction projects such as platform pedals and ceilings in factories; some are used for galvanized steel wire ropes, galvanized steel pipes, and galvanized steel sheets in places with corrosion and other products. According to different products, projects, and uses, customers have different requirements for product quality, especially in terms of galvanizing quality requirements. Domestic galvanizing methods are divided into electro-galvanizing (cold galvanizing)...
Claims
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Login to View More IPC IPC(8): G01N33/20G01N1/28
CPCG01N1/28G01N33/20
Inventor 杨金艳邵彪成亚维赵灵杰阮小丽陈伟
Owner 南通市产品质量监督检验所