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淬火钢轨的低倍腐蚀方法很多,但都不够理想。我们选取不同工艺淬火的钢轨,进行反复试验发现,用硝酸一盐酸两次腐蚀法显示淬火钢轨帽形,其效果很好。试样由淬火钢轨上用氧炔焰切取(要留出热影响区),加工成低倍试片,擦洗干净。将试片浸入15％硝酸水溶液中(磨面朝上)。由于腐蚀过程中有黑色产物沉积于试片表面,要不断刷去沉积物。在室温浸蚀3～4分钟,待淬火层显示清晰后取出,在流水中刷洗。然后再将试片浸入10％盐酸水溶液中(磨面朝上),室温浸蚀5秒钟,在流水中冲
Hardened rail low corrosion times are many, but not ideal. We select the different process of quenching the rail, repeated tests found that the use of nitric acid hydrochloric acid twice quenching shows quenched rail cap, the effect is very good. Samples from the quenched rail with oxygen acetylene flame cut (to stay out of the heat affected zone), processed into a low test piece, scrub clean. The test piece immersed in 15% nitric acid solution (grinding side up). As a result of the corrosion of black product deposition in the test piece surface, we should continue to brush the sediment. Etching at room temperature for 3 to 4 minutes until the hardened layer shows clear removed, brushing in running water. Then the specimen immersed in 10% hydrochloric acid solution (grinding side up), room temperature etching for 5 seconds, washed in the water