为观察高纯金的显微组织，常用王水对金相试样进行腐蚀，该腐蚀剂存在环境污染性强和安全隐患大等问题。分别采用王水和氯化铁盐酸双氧水的混合水溶液对高纯金进行金相腐蚀，并对腐蚀效果进行了对比分析。结果表明：采用王水和氯化铁盐酸双氧水混合水溶液两种腐蚀剂对高纯金均有腐蚀效果，采用氯化铁盐酸双氧水混合水溶液更环保和安全，且对金的腐蚀效果比王水的更好，腐蚀后试样的显微组织更清晰且无氧化膜。高纯金腐蚀的关键是存在氧化剂以及可与金形成可溶配合物的离子。

In order to observe the microstructure of high purity gold, the metallographic samples were often corroded by aqua regia, which had many problems such as strong environmental pollution and great potential safety hazard. Aqua regia and the mixed aqueous solutions of ferric chloride and hydrogen peroxide were used to corrode the high purity gold, and the results were compared and analyzed. The results show that the two kinds of etchants, aqua regia and ferric chloride hydrogen peroxide mixture solution, could corrode the high purity gold, and it was more environmentally friendly and safe to use ferric chloride hydrogen peroxide mixture solution. The corrosion effect of the mixed solution of ferric chloride and hydrogen peroxide was better than that of aqua regia, and the microstructure of sample after corrosion more clearly and without oxide film. The key to the corrosion of high purity gold was the presence of oxidants and ions which could form soluble complexes with gold.