镀锌铁丝质量的优劣,一般来说,是表现在锌层厚度和锌层的靱性两个方面。因此,镀锌层也就必须具有比较合适的组织结构。目前,我们采用的检验方法有金相测定法和电解测定法两种。用这两种方法检验镀锌层时,其结果的正确与否还决定于检验操作的每一个步骤。例如:金相测定法的样片制备和侵蚀过程,以及所选择的侵蚀溶液的性能等,都对试验结果有密切的关系。有时往往因磨片不当或溶液和侵蚀时间不合适而造成不正确的鉴定结果。如用稍呈酸性的Al_2O_3粉抛光时,使磨好的样品锌层全部或部分变黑。因此,就必须要有科学的操作方法。检验镀锌铁丝锌层组织的一些操作步骤如下。一、金相测定法(1)试样的制备:1)试样的镀铜:用一般方法制备镀锌铁丝金相样片时,镀锌层很容易脱掉。因此,在镶制样片前,必须对样品进行镀铜,其厚度一般在0.01mm 左右。我们经多次试验证明,镀铜操作对镀锌层之组织没有 The pros and cons of galvanized iron wire quality, in general, is reflected in the thickness of the zinc layer and the Zhan two aspects. Therefore, galvanized layer also must have a more appropriate organizational structure. At present, we use the test method metallographic determination and electrolytic determination of two. When these two methods are used to test the zinc coating, the result of the test is determined by the correctness of each test step. For example: Metallographic determination of sample preparation and erosion process, as well as the choice of erosion solution performance, etc., are closely related to the test results. Sometimes incorrect results are often caused by improper grinding or improper solution and erosion times. Such as slightly acidic with Al_2O_3 powder polishing, the polished sample of zinc layer all or part of black. Therefore, we must have a scientific method of operation. Check the galvanized wire and zinc layer of the organization of some of the steps are as follows. First, the metallographic determination (1) Preparation of the sample: 1) sample of copper plating: the general method of preparation of galvanized iron wire metallographic sample, the zinc coating is easy to take off. Therefore, in the sample before the mosaic, the sample must be copper plating, the thickness is generally about 0.01mm. We have proved that after several experiments, the operation of the copper plating on the organization of galvanized layer is not