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首页> 外文期刊>Corrosion Engineering, Science and Technology >Zinc precipitation runoff from galvanised steel in humid tropical climate
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Zinc precipitation runoff from galvanised steel in humid tropical climate

机译：潮湿热带气候中镀锌钢中锌的沉淀径流

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Worldwide hot dip galvanising is the most important application of a zinc coating as an efficient method for steel corrosion protection. In southeastern Mexico, in humid tropical climate, the domestic statistics reports that 63% of roofs and walls are made from galvanised sheets, which suffer corrosion damage. When zinc corrosion products are dissolved by dew and rain, zinc ions are released from the corroded surface and dispersed to the environment. This phenomenon, known today as the metal runoff process, is being paid enormous attention. In order to make an accurate estimation of zinc runoff induced by atmospheric corrosion in humid tropical climate, samples of hot dip galvanised steel have been exposed for two years in the Gulf of Mexico environments. The annual zinc runoff rates in both test sites decreased by ～50% in the second year (2.70-3.28 g m~(-2)/year), as compared to those measured in the first year of exposure (6.52-7.98 g m~(-2)/year). The zinc mass loss has been related to several independent parameters, which control the runoff process. Runoff solutions collected from the samples in exposure after the first flushes of rain, always showed pH values in the range 5.5-7.0, when the rainwater was more acidic (pH 4.7-6.10). The carbonate ion (CO_3)~(2-)_3 concentration detected in zinc runoff solutions reached values 1.6-1.7 times higher than those measured in rainwater, due to dissolved zinc carbonate corrosion product. Several chloride containing corrosion products, not released by rain events, were detected as major and minor phases by XRD during the exposure of galvanised steel.
机译：全球范围内的热浸镀锌是锌涂层作为钢腐蚀防护的有效方法的最重要应用。在墨西哥东南部，在潮湿的热带气候中，国内统计数据表明63％的屋顶和墙壁是由镀锌板制成的，这些镀锌板遭受腐蚀破坏。当锌腐蚀产物被露水和雨水溶解时，锌离子会从腐蚀的表面释放出来并扩散到环境中。这种现象今天被称为金属径流过程，受到了极大的关注。为了准确估计在潮湿的热带气候中大气腐蚀引起的锌径流，热浸镀锌钢的样品在墨西哥湾环境中暴露了两年。与暴露第一年的测量值（6.52-7.98 gm〜（年）相比，第二个试验场的年锌径流率在第二年（2.70-3.28 gm〜（-2）/年）下降了约50％。 -2年）。锌的质量损失与控制径流过程的几个独立参数有关。第一次雨水冲刷后，从暴露于样本的径流溶液中采集的径流溶液始终显示pH值在5.5-7.0范围内，而雨水的酸度更高（pH值为4.7-6.10）。由于溶解的碳酸锌腐蚀产物，在锌径流溶液中检测到的碳酸根离子（CO_3）〜（2-）_ 3浓度比雨水中的碳酸根离子浓度高1.6-1.7倍。 XRD在镀锌钢的暴露过程中，发现了几种不受雨水释放的含氯化物腐蚀产物，分别作为主要和次要相。

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