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工件经过热处理工艺(盐油浴过程)后,通常在金属表面产生黑色或灰黑色的斑迹。我厂经过多次试验,证明用下列方法可以防治:工件在装卡淬火前,先在碳酸钠(Na_2CO_3)5～6％的水溶液中清洗一次,温度70～80℃,清洗时间10～15分钟,以去除工件表面上所沾上的杂质如油污、有机酸类等。以后又在矽酸钠(Na_2SiO_3)3～4％的水溶液中洗滌温度70～80℃,将工件上下左右提浸二三次,以排除残留的碱液,防止生锈。随后即取出装卡,准备淬火(淬火工艺从略)。工件经热处理后,按下列步骤清理:
After the workpiece through the heat treatment process (salt oil bath process), usually on the metal surface to produce black or gray-black stains. Our factory has been tested many times to prove that the following methods can be used to prevent and control: The workpiece is loaded with a card before quenching, first in sodium carbonate (Na_2CO_3) 5 ~ 6% aqueous solution once washed at a temperature of 70 ~ 80 ℃, cleaning time 10 to 15 minutes , To remove the surface of the workpiece stained with impurities such as oil, organic acids and so on. Later in the sodium silicate (Na_2SiO_3) 3 ~ 4% aqueous solution washing temperature 70 ~ 80 ℃, the workpiece up and down leaching two or three times to rule out residual lye, to prevent rust. Then remove the card installed, ready to quench (quenching process omitted). Workpiece after heat treatment, according to the following steps to clean up: