Abstract

A protective novel (MgO) oxide layer (with 91.92% corrosion protection efficiency) was successfully applied on Mg–0.4%Ca alloy using protective oxidation at 390°C (without any pre-treatment). Oxide layer coated Mg alloy was then coated with pure epoxy coating (as top coat). This oxide inner barrier layer protected Mg substrate from 3.5wt % NaCl solution when it passes through from epoxy top layer. Lowest anodic current density and highest charge transfer resistance (1118.124 kΩ cm²) and impedance modulus (│Z│) at low frequency substantiated that the existence of thick epoxy top layer which is integrated (via physical anchoring) with the oxide inner barrier layer could considerably reduce the corrosion rate of magnesium substrate in the chloride containing solutions. Moreover, corrosion mechanism for coated Mg–0.4%Ca alloys was then suggested.

中文翻译：

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镁合金上新型环氧/氧化物层（MgO）涂层的制备及耐蚀性评估

摘要

一种新型的保护性（MgO）氧化层（具有91.92％的腐蚀防护效率）已成功在390°C的保护性氧化条件下（无需任何预处理）应用于Mg–0.4％Ca合金。然后用纯环氧涂层（作为面漆）涂覆氧化层涂覆的Mg合金。当该氧化物内部阻挡层从环氧顶层穿过时，该保护层可保护Mg衬底免受3.5 wt％NaCl溶液的影响。低频下最低的阳极电流密度和最高的电荷转移电阻（1118.124kΩcm ²）和阻抗模量（│Z│）证明存在集成的厚环氧顶层（（通过物理锚固）与氧化物内部阻挡层的结合可以大大降低含氯溶液中镁基质的腐蚀速率。此外，然后提出了对Mg–0.4％Ca涂层合金的腐蚀机理。