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[求助]
急求翻译为中文，化学式可以不管
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The inhibiting power of anti-corrosive pigments depends upon a number of parameters, namely the pigment solubility,the pH, the properties of the substrate and the composition of the solution. The levels of inhibitor concentration achieved in the extracts were much lower for the phosphate than for the chromate, although in both cases the inhibiting effect has proved to be sufficient to provide high inhibition efficiency to zinc in 0.1 M NaCl. In both cases, inhibition was the result of the formation of a layer of inhibitor on the surface. In the chromate , the film was formed instantly after immersion. In-hibition by the phosphate was a slower process, as confirmed by the SVET and the OCP measurements. The chromate was also the more efficient inhibitor. On the bare metal, it led to the highest charge transfer resistance and also to the devel-opment of a protective layer characterized by a capacitance decrease of approximately two orders of magnitude, when compared with the reference solution. When these pigments are used in a coating, leaching to the solution is the first step towards inhibition. Since this is a slow process, inhibition can only be detected after a sufficient concentration of inhibitor is achieved near the metal. The mechanisms of passivation by zinc chromate are usually described by an oxidizing action of CrO42−. In the process of film formation, Cr(VI) is reduced to Cr(III), while Zn is oxidized to Zn(OH)2, according to the reaction scheme 3Zn + 2CrO42 −+ 5H2 O →3Zn(OH)2 + Cr2 O3 + 4OH− Chromate is usually considered to act especially at the dam-aged areas of the coating, where the electropositive metals are left exposed to the aggressive medium, and are therefore available for providing free electrons for chromate reduction. For the conditions of our experiments and for the duration of the tests, we found none of the pigments had the power to inhibit the corrosion occurring at the defect. |
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shiranjiang
金虫 (正式写手)
- 翻译EPI: 14
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RXMCDM: 金币+1 2014-05-10 17:56:36
幻雪之恋: 金币+50, 翻译EPI+1, ★有帮助 2014-05-11 13:58:17
RXMCDM: 金币+1 2014-05-10 17:56:36
幻雪之恋: 金币+50, 翻译EPI+1, ★有帮助 2014-05-11 13:58:17
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防锈颜料的抑制能力取决于许多参数,即色素的溶解性、pH值、基质的性质和溶液的成分。虽然在磷酸盐中提取得到的抑制剂的浓度等级比在铬酸盐中低得多，但在这两种情况下，其抑制效果已足够为0.1 M氯化钠溶液中的锌提供高的抑制效率。在这两种情况下，抑制作用是在表面形成一层抑制剂的结果。在铬酸盐中，浸入后立即形成薄膜。SVET和OCP的测量结果证实了在磷酸盐中的抑制作用是一个缓慢的过程，铬酸盐也是一种更有效的抑制剂。在裸露的金属上，与参考溶液相比，它导致了最高电荷转移电阻，也导致了以一个电容减少约两个数量级为特点的保护层的发展。当在涂料中使用这些颜料时，抑制的第一步是从溶液中浸出，因为这是一个缓慢的过程，只有金属附近抑制剂的浓度足够时，才能检测到抑制作用。通常用CrO42−的氧化作用来描述锌铬酸盐的钝化机制，根据化学反应方程，在膜的形成过程中，Cr(VI) 还原成Cr(III)，而Zn被氧化，生成Zn(OH)2。 3Zn + 2CrO42 −+ 5H2 O →3Zn(OH)2 + Cr2 O3 + 4OH− |
2楼2014-05-10 13:31:27