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彩涂铝板的防锈性能

返回列表 来源: 发布日期: 2019.09.14

铝板的防锈性能   

     彩涂铝板eds定性分析表明,肉眼可见的黑斑中的铁、锰含量明显高于防锈铝板的正常含量。半定量结果表明,腐蚀产物中氧含量较高,说明腐蚀部位已被严重氧化,而白点结果表明腐蚀产物中存在着氧化铝。       

   彩涂铝板从横截面金相试样的抛光状态可以看出,防锈铝板本身已被腐蚀,其表面的腐蚀产物来源于基体的腐蚀,具有点蚀的特点。        aes分析结果与eds分析结果一致,且aes分析结果不受基体铝的影响,检测出纯表面组分(纳米级)。除铝、氧、碳、硫、氯外,黑点处还检测到铁等元素。铁的存在加速了氯离子介质中的点蚀。      

    彩涂铝板x射线光电子能谱分析结果表明,腐蚀过程中发生了重要的化学反应。防锈铝板表面的白点和黑点是铝板腐蚀产生的腐蚀产物,主要含有氧化铝和氢氧化铝等杂质。通常,铝板表面有一层致密的氧化铝膜,不含al(oh)3。        结果表明,在防锈铝板表面发生了al2o3 al(oh)3与o2的化学反应。

Antirust Property of Aluminum Plate
Qualitative analysis of EDS shows that the iron and manganese contents in black spot spots visible to the naked eye are significantly higher than the normal contents of rust-proof aluminium sheets. Semi-quantitative results show that the oxygen content is high, which indicates that the corrosion site has been seriously oxidized, while the white spot results show that Al2O3 exists in the corrosion products.
From the polishing state of cross-section metallographic samples, it can be seen that the rust-proof aluminium plate itself has been corroded, and the corrosion products on its surface come from the corrosion of its matrix, and have the characteristics of pitting corrosion.
The results of AES agree well with those of EDS, and AES results are not affected by matrix aluminium, and pure surface components (nano-scale) are detected. In addition to aluminum, oxygen, carbon, sulfur and chlorine, iron and other elements were also detected at the black spot. The existence of iron accelerates the pitting corrosion in the medium containing chloride ions
The results of X-ray photoelectron spectroscopy show important chemical reactions in the corrosion process. White spots and black spots on the surface of rust-proof aluminium sheet are corrosion products produced by corrosion of aluminium sheet, which mainly contain some impurities such as Al2O 3 and Al (OH) 3. In general, there is a dense Al2O3 film on the surface of the aluminium plate, which does not contain Al (OH) 3.
It can be concluded that the chemical reaction of Al2O3 Al (OH) 3 with O2 on the surface of rust-proof aluminium sheet occurs.

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