首次选用CIE1976 L*a*b*色空间中的总色差ΔE*作为0Cr18Ni9不锈钢冷轧卷碱洗工艺后表面质量的评价指标。在简述表色系统CIE1976 L*a*b*色空间及色差公式测量原理和测量方法的基础上，用TCPⅡG全自动测色色差计测量了不锈钢板表面颜色。并对碱洗工艺参数进行了正交试验和方差分析，通过F检验判定出各工艺参数的显著性及其顺序，最后给出了碱洗工艺参数的最佳结果。碱洗最佳工艺条件为：碱洗配方80%NaOH+20%NaNO3、碱洗温度550 ℃、碱洗时间25 s。因子显著性顺序为：碱洗温度>碱洗配方>碱洗时间。碱洗时间因子不显著，可作为连续生产线调控参数，依据生产线速度和碱洗槽长度设置碱洗时间。
Total chromatism ΔE* in CIE1976 L*a*b* color space was used firstly as evaluation index of surface quality of alkaline cleaned 0Cr18Ni9 stainless cold rolled coil. According to the measurement principle and method with CIE1976 L*a*b* color space and chromatism equation, the surface color of stainless steel sheet was mesured by TCPⅡG full automation color difference meter. Orthogonal test and ANOVA were carried for alkaline cleaning process parameters. The significance and sequence of the process parameters were determined by F Test, and the optimum alkaline cleaning process parameters were obtained. The optimum formula was 80%NaOH+20%NaNO3, the appropriate temperature and time were 550 ℃, 25 seconds respectively. Factor significance sequence was temperature>formula>time. The cleaning time was not significant, it could be regarded as system control parameter and set based on line velocity and cleaning tank length.
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