Ohno H
Shika Rikogaku Zasshi. 1976 Nov;17(40):313-21.
The specimens which were cast from commercial alloys were polished metallographically and then oxidized at 800 degrees C for 1 hour in air. The results obtained were as follows: 1. The reduction rate of Cu aginast the original Cu amount in the alloy is given by the following equation: (see article) where S is surface area of the casting, KW is oxidation rate constant, t is time, Wc is weight of the casting, Ccu is weight percent of Cu, and n is between 1 and 2. 2. Owing to decrease of the Cu concentration in the outer layer of the alloy, the age-hardening did not appear in that layer. 3. Reflexibility of the polished surface of alloys became lower than that of the matrix due to precipitation of the oxide particles. 4. Hardness numbers of the internal oxidation zone (oxide particles, ZnO) decreased to 1/2 of the matrix. 5. The surface roughness of specimens after pickling was affected by the shape of oxide particles in the internal oxidation zone and varied with the different commercial alloys. 6. The dimensional change of casting due to oxidation is given by the following equation: (see article) where sigmacu is density of copper, KW is oxidation rate constant, t is time and n is between 1 and 2.
将商业合金铸造而成的试样进行金相抛光，然后在800摄氏度的空气中氧化1小时。得到的结果如下：1. 合金中铜相对于原始铜含量的还原率由以下公式给出：（见文章）其中S为铸件表面积，KW为氧化速率常数，t为时间，Wc为铸件重量，Ccu为铜的重量百分比，n在1到2之间。2. 由于合金外层铜浓度降低，该层未出现时效硬化。3. 由于氧化物颗粒的析出，合金抛光表面的反射率低于基体。4. 内氧化区（氧化物颗粒，ZnO）的硬度值降至基体的1/2。5. 酸洗后试样的表面粗糙度受内氧化区氧化物颗粒形状的影响，并因商业合金不同而变化。6. 氧化导致的铸件尺寸变化由以下公式给出：（见文章）其中sigmacu为铜的密度，KW为氧化速率常数，t为时间，n在1到2之间。
