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亚硝酸钠加三乙醇胺水溶液是一种无机盐与有机质相混合的淬火介质。其成分是15％亚硝酸钠加1％三乙醇胺。我们知道,水中加入单一的亚硝酸钠,能加速蒸汽膜破裂,提高冷却能力,用单一亚硝酸钠水溶液淬火,其缺点是低温转变区间(即马氏体转变区间)瞬间冷却速度较快见图1,15％亚硝酸钠水溶液300～200℃区间瞬间冷却速度约50～30℃/秒。低温转变区间冷却速度太快是造成零件变形与开裂的重要原因。三乙醇胺系无色粘稠的吸湿性液体。在空气中颜
Sodium nitrite plus triethanolamine solution is a mixture of inorganic salts and organic quenching medium. Its composition is 15% sodium nitrite plus 1% triethanolamine. We know that the addition of a single sodium nitrite in the water accelerates the rupture of the steam film and increases the cooling capacity. Quenching with a single aqueous sodium nitrite solution has the disadvantage that the instantaneous cooling rate in the low-temperature transition range (ie, the martensitic transformation range) 1, 15% sodium nitrite aqueous solution 300 ~ 200 ℃ interval cooling rate of about 50 ~ 30 ℃ / sec. Low temperature transition range cooling too fast is an important part of the deformation and cracking. Triethanolamine is a colorless viscous hygroscopic liquid. Color in the air