热处理工艺: 水蒸气氧化处理 (借助高温水蒸气在产品表面形成Fe3O4黑色氧化膜)
Heat Treatment: Steam Oxidizing Surface Treatment (Black oxide film of Fe3O4 is formed by high-temperature)

氧化炉 (黑化炉) 优点:
于氮化层 (白亮层) 上形成黑色氧化膜 (Fe3O4)，带有光泽，质地均匀，无色差。氮化氧化复合膜 (Oxy-Coat)，借助于氧化膜的封孔作用，提高工件的耐腐蚀性，耐磨性，耐容损性等。使用水蒸气处理，对人体及环境无害。

Advantages of Using Steam Oxidizing Furnace:
The black oxide film (Fe3O4) formed on the nitride layer is glossy, uniform and cause no color differences. The film of Oxy-Coat can improve the corrosion resistance, wear resistance and solution resistance, etc. by the pore sealing effects. Stream treatment is harmless to human bodies and environment-friendly.