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首页> 外文期刊>ISIJ international >Effect of Phosphate and Chromate Pigments on Sacrificial Corrosion Protection by Al–Zn Coating and Delamination Mechanism of Pre-painted Galvalume Steel
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Effect of Phosphate and Chromate Pigments on Sacrificial Corrosion Protection by Al–Zn Coating and Delamination Mechanism of Pre-painted Galvalume Steel

机译：磷和铬酸盐颜料对铝锌合金牺牲腐蚀防护的影响及预涂镀铝锌钢板的脱层机理

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The effect of Mg_(3)(PO_(4))_(2) and SrCrO_(4) pigments in paint layer on the corrosion behavior of 55 mass% Al–Zn coating at the cut edges and the delamination mechanism of the organic paint at cross-cut areas of pre-painted galvalume steels were examined using wet/dry cycle corrosion tests. The Mg_(3)(PO_(4))_(2) pigment did not inhibit white rust formation at the cut edges and the delamination of the organic paint. On the other hand, the SrCrO_(4) pigment suppressed white rust formation and improved the delamination resistance of the organic paint. Observations of the cross sections of the cross-cut area indicate that delamination was the result of the formation of corrosion products in the Al–Zn layer under the organic paint layer, thus the SrCrO_(4) pigment inhibited the delamination of the organic paint layer by reducing the corrosion rate of the Al–Zn layer. The Kelvin probe force microscopic measurements revealed that while the addition of the anti-corrosive pigments increased the corrosion potential of the Al–Zn layers, it did not affect the electrochemical properties of the steel substrates. The increases in the corrosion potential can be attributed to the barrier effect of the corrosion products containing chromate pigments on the Al–Zn layer against anodic dissolution. From these results, it is reasonable that chromate pigments effectively increase the delamination resistance of organic paint layers on pre-painted galvalume steels under atmospheric corrosion conditions. In addition, phosphate pigments would improve the corrosion resistance of Al–Zn layers in atmospheric environments with low chloride concentrations.
机译：涂料层中Mg_（3）（PO_（4））_（2）和SrCrO_（4）颜料对55质量％Al-Zn涂层切边腐蚀行为的影响以及有机涂料的分层机理使用湿/干循环腐蚀试验检查了预涂镀锌钢板的横切区域的腐蚀。 Mg_（3）（PO_（4））_（2）颜料未抑制切割边缘的白锈形成和有机涂料的分层。另一方面，SrCrO_（4）颜料抑制了白锈的形成并改善了有机涂料的耐分层性。对横切面横截面的观察表明，分层是有机涂料层下面的Al-Zn层中腐蚀产物形成的结果，因此SrCrO_（4）颜料抑制了有机涂料层的剥离。通过降低铝锌层的腐蚀速率。开尔文探针力显微镜测量显示，尽管添加了抗腐蚀颜料可增加Al-Zn层的腐蚀电位，但它不会影响钢基底的电化学性能。腐蚀电位的增加可以归因于Al-Zn层上含有铬酸盐颜料的腐蚀产物对阳极溶解的阻挡作用。从这些结果来看，在大气腐蚀条件下，铬酸盐颜料有效地提高了预涂镀铝锌钢板上有机涂料层的抗分层性是合理的。另外，磷酸盐颜料将在低氯化物浓度的大气环境中提高Al-Zn层的耐腐蚀性。

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