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采用溶剂法在430~530℃分别在Q235钢基体上制备了热镀Galfan合金镀层,运用扫描电镜、X射线衍射仪分析了浸镀温度对合金镀层界面组织的影响。结果表明:浸镀温度为430~450℃时,界面层生长速度缓慢;当温度高于470℃时,界面层生长速度变快,高温时界面层的生长速度为低温界面层生长速度的2倍。浸镀温度为430~450℃时,界面层分为两层,远离基体部分为圆片状组织,尺寸为1~3μm;靠近基体部分为椭球状组织,尺寸约为几百纳米。浸镀温度为470~530℃时,界面层全部为椭球状组织,尺寸为3~6μm。其中圆片状组织为FeAl_3相,椭球状组织为Fe_2Al_5Zn_(0.4)组成。随着浸镀温度的提高,界面层组织晶粒逐渐变大。
Galfan alloy coating was prepared on Q235 steel substrate at 430-530 ℃ by solvent method. The effect of immersion temperature on the interface microstructure of the alloy coating was analyzed by scanning electron microscopy and X-ray diffraction. The results show that the growth rate of interfacial layer is slow when the immersion temperature is in the range of 430-450 ℃. When the temperature is higher than 470 ℃, the growth rate of interfacial layer becomes faster and the growth rate of interfacial layer is twice that of low-temperature interfacial layer at high temperature. . The immersion temperature is 430 ~ 450 ℃, the interface layer is divided into two layers, away from the matrix part of the wafer-shaped organization, the size of 1 ~ 3μm; near the matrix part is ellipsoid-like structure, the size of about a few hundred nanometers. When the immersion temperature is 470 ~ 530 ℃, the interface layer is all ellipsoid with the size of 3 ~ 6μm. Among them, the disk-like structure is FeAl_3 phase and the ellipsoid is Fe_2Al_5Zn_ (0.4). With the increase of immersion temperature, the interfacial layer grains gradually become larger.