Method for characterizing thickness of galvanized passivation film
A passivation film and characterization technology, applied in measurement devices, instruments, thermal excitation analysis, etc., can solve the problems of the difficulty of effectively controlling the thickness of galvanized passivation film, the inability to accurately reflect the average level of passivation film thickness, etc., which is conducive to production. Quality Control, Improve Test Accuracy, Avoid Residual Effects
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Embodiment 1
[0030] A method for characterizing the thickness of a galvanized passivation film, comprising the following steps:
[0031] (1) Use nitric acid solution with a concentration of 5% to configure 100mg / L chromium solutions into a group of chromium solutions with chromium concentrations of 0.0mg / L, 0.4mg / L, 0.6mg / L, 0.8mg / L and 1.0mg / L Chromium standard solution; wherein, the preparation method of 5% nitric acid solution is: 5mL analytically pure nitric acid (65%~68%) is fixedly dissolved in 100mL volumetric flask with deionized water, and shakes up;
[0032] (2) adopt atomic emission spectrometry to measure the emission intensity of the chromium standard solution series configured in (1) respectively, take the chromium concentration as the abscissa, and take the emission intensity of the corresponding spectral line of the chromium element as the ordinate to draw a calibration curve;
[0033] (3) Set the known surface area as 10cm 2 Zinc-plated passivation film (for example, a pa...
Embodiment 2
[0044] Get 10 pieces of galvanized samples at the same level as in Example 1, under the same operating conditions, respectively passivate 10s, 20s, 30s, 40s, 50s, 60s, 70s, 80s, 90s, 100s, then carry out galvanized passivation respectively Film thickness characterization, the characterization method is the same as in Example 1.
[0045] Chromium concentration test result is as in embodiment 1 and embodiment 2 figure 1 Correspondingly, the thickness values of the passivation film with different chromium concentrations are shown in Table 2. Depend on figure 1 It can be seen that within 50s, the chromium content in the passivation film per unit surface area rises linearly, that is, the thickness of the passivation film gradually increases; the chromium concentration in the passivation film reaches the maximum value of 3.98μg / cm2 when the passivation is 50s 2 . After the passivation time exceeds 50s, part of the passivation film dissolves, and the chromium content in the film...
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