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冷绕弹簧后一般都要经定型回火,然后发蓝,我们将定型回火与发蓝合并成一步完成。方法是:将固体苛性钠(工业用)放在铁槽中加热熔化,再加入亚硝酸钠(工业用)10％(重量比),待全部熔化后用水银温度计侧温,当温度符合回火温度(我们用350℃),即将经过清洗、烘干的弹簧置于铁丝筐内,沉入液中,几分钟后工件表面就依次出现淡黄→金黄→蓝→黑色氧化
After the cold around the spring generally have to tempering stereotypes, and then blue, we will stereotypes tempering and blue merger into one step. The method comprises the following steps: solid caustic soda (industrial use) is heated and melted in an iron tank, then 10% (weight ratio) of sodium nitrite (industrial use) is added, and after being melted, the temperature is side tempered by a mercury thermometer, Temperature (we use 350 ℃), about to be cleaned, drying the spring placed in wire basket, sink into the liquid, a few minutes after the surface of the workpiece appear yellow → golden → blue → black oxidation