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Corrosion protection properties summarised in Tables VI-VIII and shown in Figures 12-14 showed that:
1 all paint films derived from the formulation groups showed excellent filliform corrosion resistance, showing corrosion only in the scratched area; and
2 paint films containing 3Fe2O3: 1Al2O3 and 1Fe2O3: 3Al2O3 showed the highest resistance, while a lower resistance was imparted by films containing 1Fe2O3: 1Al2O3 and Fe2O3.
Such observations may be attributed to the fact that both iron
oxide and aluminium oxide have the same chemical formula, i.e. one can replace the other in its crystal lattice easily exhibiting a synergistic effect, where a pure solid solution is formed, with a homogeneous texture.
In the case where there is a presence of one of the two oxides at a higher concentration than the other in the solid solution, good corrosion resistance results. Both iron oxide and alumina exhibited a barrier effect. At their presence in equal concentrations, the anticorrosion protection properties showed lower values. This may be attributed to the fact that their barrier effects contradict each other. At presence of one of the two components in a higher concentration than the other, its barrier effect prevails allowing the formation of a stable complex with steel substrate to be formed giving a better anticorrosion protection effect.

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1樓 2014-09-22 12:10:11

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籃球少年: 金幣+10, 翻譯EPI+1, ★★★很有幫助 2014-09-23 09:44:56

總結(jié)于表 VI-VIII和圖12-14的防腐蝕保護(hù)性表明：
1、從各組配方得到的所有涂膜都具有優(yōu)異的防蝕性，腐蝕僅出現(xiàn)在劃痕處;
2、含有 3Fe2O3: 1Al2O3和1Fe2O3: 3Al2O3 的涂膜防腐性能最高，而含1Fe2O3: 1Al2O3和Fe2O3者則防腐能力較低。
這樣的觀察可能是由于這樣的事實(shí)，就是鐵氧化物和氧化鋁兩者具有相同的化學(xué)式，即二者在其晶格中可以很容易的互相替代，且表現(xiàn)出了協(xié)同作用，形成一種純固溶體，具有均勻的紋理。
在固液相中，當(dāng)兩種氧化物中的一種的濃度更高時(shí)，其耐腐蝕性結(jié)果良好。氧化鐵和氧化鋁二者均具有屏障作用。當(dāng)它們的濃度相同時(shí)，其防腐保護(hù)特性較低。這可能歸因它們的相互茅盾的屏障作用。當(dāng)一種濃度高于另一種濃度時(shí)，屏障作用占優(yōu)勢(shì)者可以允許與鋼基體形成一穩(wěn)定的復(fù)合物，從而得到更好的防腐蝕保護(hù)作用。

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2樓2014-09-22 22:39:28

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