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首页> 外文会议>5th International Conference on Zinc and Zinc Alloy Coated Steel Sheet, 5th, Jun 26-28, 2001, Brussels, Belgium >INFLUENCE OF MG CONTENT IN COATING LAYER AND COATING STRUCTURE ON CORROSION RESISTANCE OF HOT-DIP ZN-AL-MG ALLOY COATED STEEL SHEET
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INFLUENCE OF MG CONTENT IN COATING LAYER AND COATING STRUCTURE ON CORROSION RESISTANCE OF HOT-DIP ZN-AL-MG ALLOY COATED STEEL SHEET

机译：镀层和镀层中镁含量对ZN-AL-MG热浸镀锌钢板耐蚀性能的影响

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摘要

The corrosion resistance and corrosion behavior of hot-dip Zn-6%Al-0～3%Mg alloy coated steel sheets in cyclic corrosion test were studied fundamentally. Hot-dip Zn-4.5%Al-0.1%Mg and Zn-0.2%Al alloy coated steel sheet were similarly studied for comparison. The corrosion resistance of Zn-6%Al-Mg alloy coated steel sheets is improved with increment of Mg content, remarkable improvement of corrosion resistance is observed at 3% Mg. An extensive study using SEM, XRD, EPMA and electrochemical measurements reveals that most part of the surface of the Zn-6%Al-3%Mg alloy coated layer consists of a fine Zn/Al"/Zn_2Mg ternary eutectic structure. The whole surface of it is covered with the thin layer of zinc chloride hydroxide containing Mg at the early stage of corrosion. This zinc chloride hydroxide containing Mg is protective for the coating layer and so stable that the formation of non-protective zinc carbonate hydroxide and zinc oxide are suppressed for long periods compared with Zn-4.5%Al-0.1%Mg and Zn-0.2%Al. As corrosion proceeded, most part of Mg is taken into the upper Zn corrosion products and finally drained away, while most part of Al remains on the specimens by forming stable zinc aluminum carbonate hydroxide containing Mg for a long duration such as 200 cycles in CCT and suppresses corrosion of the residual coating layer and the steel substrate.
机译：从根本上研究了循环浸镀锌-6％Al-0〜3％Mg合金热浸镀锌钢板的耐蚀性和腐蚀行为。相似地研究了热浸镀锌-4.5％Al-0.1％Mg和锌-0.2％Al合金涂层钢板的比较。 Zn-6％Al-Mg合金涂层钢板的耐蚀性随Mg含量的增加而提高，在3％Mg时观察到耐蚀性显着提高。使用SEM，XRD，EPMA和电化学测量进行的广泛研究表明，Zn-6％Al-3％Mg合金涂层的大部分表面由精细的Zn / Al“ / Zn_2Mg三元共晶结构组成。整个表面在腐蚀的初期阶段，其表面被一层含镁的氯化锌氢氧化物薄层覆盖，这种含镁的氯化锌对涂层起保护作用，并且非常稳定，以致形成非保护性碳酸锌和氧化锌。与Zn-4.5％Al-0.1％Mg和Zn-0.2％Al相比，其被长期抑制。随着腐蚀的进行，大部分Mg被带入上部Zn腐蚀产物中并最终被排出，而大部分Al保留在通过在CCT中长时间（例如200次循环）形成稳定的含Mg的碳酸氢锌铝制成的试样，可以抑制残留涂层和钢基材的腐蚀。

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