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金相试样在磨抛后经化学试剂侵蚀,在试样的表面会不同程度地出现一些复盖的氧化物,特别是高碳钢的回火组织及纯铜、铜合金等组织,上述现象更为明显。其复盖的氧化物使金相组织失去应有的层次,且样品的表面被污染成各种颜色,失去了金相组织的真实形貌。因此,清洁金相试样的表面成了确保制样质量的重要环节,经过我们反复的实践,发现使用5～10%的盐酸酒精溶液清洗样品表面,能获得良好的效果。具体操作方法如下:
Metallographic samples after grinding and polishing by chemical agents erosion, the surface of the sample will appear to some extent, some covered oxide, especially high-carbon steel tempering and pure copper, copper alloy and other organizations, the above phenomenon More obvious. The covered oxide loses the proper level of metallographic structure, and the surface of the sample is polluted into various colors, losing the true shape of the metallographic structure. Therefore, cleaning the surface of the metallographic sample has become an important part of ensuring sample preparation quality. After repeated experiments, we found that the use of 5 to 10% hydrochloric acid solution to clean the sample surface can achieve good results. Specific methods of operation are as follows: