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当表面层含氮达10～11%时使渗氮层发生脆性,此时表面层形成整个ε相外壳。通常所说的“白层”即渗氮后部件的表面层上深达0.002时的氮化铁层,这种氮化铁层使渗氮后的部件在使用过程中发脆和开裂,因此需要消除。一般是在渗氮后再进行脱氮,即可减低氮的浓度,使表面层的脆性显著地降低而不致减低其硬度和耐磨性。现在有一种新的消除“白层”方法:把渗氮后的部件浸入热的氰化钠碱性溶液中约8小时。溶液的规范为:1磅氰化
When the surface layer of nitrogen up to 10 ~ 11% brittle nitriding layer, then the surface layer to form the entire ε phase shell. The so-called “white layer” is the nitrided layer on the surface layer of the component after nitriding up to 0.002, which makes the nitrided component brittle and cracked during use, So need to eliminate. Denitrification is generally performed after nitriding to reduce the concentration of nitrogen so that the brittleness of the surface layer is significantly reduced without decreasing its hardness and wear resistance. Now there is a new elimination “white layer” method: the nitriding components immersed in hot sodium cyanide alkaline solution for about 8 hours. The solution specification is 1 pound cyanide