【摘要】 采用可见分光光度法研究了含铬达克罗涂层分别在NaCl、蒸馏水、Na₂SO₄、NH₄Cl溶液中析出六价铬的规律.结果表明:达克罗涂层在40℃的不同浓度NaCl和Na₂SO₄溶液中浸泡13 d时,六价铬仅有微量析出,其最大析出量分别为2.25μg·cm^-2和8.56μg·cm^-2;在40℃的蒸馏水和不同浓度NH₄Cl溶液中浸泡13 d时,六价铬析出量几乎为0,涂层显示出了良好的稳定性.更多还原

【Abstract】 Precipitation law of hexavalent chromium from dacromet coating containing Cr in NaCl, distilled water,Na₂SO₄ and NH₄Cl solutions, respectively, were studied by visible spectrophotometry. The results show that when the dacromet coating was immersed in the different-concentration NaCl or Na₂SO₄ solutions at 40 ℃ for 13 d, the hexavalent chromium precipitated slightly, with the maximum precipitated mass of 2. 25 μg·cm^-2 and 8.56 μg·cm^-2, respectively.When immersed in distilled water and different-concentration NH₄Cl solution at 40 ℃ for 13 d, the precipitated mass of the hexavalent chromium was nearly zero, indicating an excellent stability of the coating.更多还原