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镀锌彩钢板对于腐蚀的特点是怎样的

返回列表 来源: 发布日期: 2020.12.29

镀锌彩钢板对于腐蚀的特点是怎样的

镀锌彩钢板暴露在空气中时,其关键问题是干腐蚀、湿冷腐蚀和湿腐蚀。

干浸蚀是指在空气湿度小于30%时,钢板表面不受连续电解质水膜的侵蚀。在这种情况下,钢的腐蚀速度相对较慢。但这种自然环境标准较少。

3水印
镀锌彩钢板的湿冷蚀刻是指在空气湿度大于30%小于100%的环境空气中对钢板进行蚀刻。在这种情况下,钢材表面有灰尘,锈层中有微孔和裂缝,使显微镜吸收并产生肉眼看不见的收缩水。原电池的原理是在收缩水的作用下产生的,腐蚀速度较快。
镀锌彩钢板湿法腐蚀是指在空气湿度超过100%的湿热环境中,当镀锌钢板表面有凝固的收缩水时,对镀锌钢板的腐蚀。在这种情况下,钢表面的收缩水过厚,使得熔化后氧气向钢表面的扩散速度相对较慢,从而降低了腐蚀速率。事实上,钢的腐蚀与两者之间表面的收缩水密切相关。而且,在水的作用下,co2溶解在水中,使铁产生弱电解质和一系列弱电解质反应。
镀锌彩钢板气体中的Te CO2连续溶解在水中,反应持续进行。由于关键产品是鲜红色,铁空气氧化后的材料一般称为“红锈”。红锈稀少
金属材料的涂层或金属材料的保护层厚度,才能合理避免钢材的腐蚀

Whe the galvanized coil is exposed to the air, the key problems are dry etching, wet cold etching and wet etching.

Dry etching of galvanized steel sheet means that the surface of steel sheet is not eroded by continuous electrolyte water film when the air humidity is less than 30%. In this case, the corrosion rate of steel is relatively slow. But this kind of natural environment standard is less.
The wet cold etching of galvanized steel sheet refers to the etching of steel sheet in ambient air with air humidity more than 30% and less than 100%. In this case, there is dust on the surface of steel, and there are micropores and crevices in the rust layer, which cause the microscope to absorb and produce shrinkage water invisible to human eyes. The principle of galvanic cell is produced under the shrinkage water, and the etching rate is relatively fast.
Wet etching of galvanized steel sheet refers to the etching of galvanized steel sheet when there is solidified shrinkage water on the surface of galvanized steel sheet in humid and cold environment with air humidity over 100%. In this case, the shrinkage water on the surface of the steel is too thick, so that the diffusion rate of oxygen to the surface of the steel after melting is relatively slow, which reduces the etching rate. In fact, the corrosion of steel is closely related to the shrinkage water on the surface between the two. What's more, with water, CO 2 is dissolved in the water, which makes iron produce weak electrolyte and a series of weak electrolyte reactions.
Te CO2 in the gas is continuously dissolved in the water, and the reaction is continuously carried out. Because the key product is bright red, the material after iron air oxidation is generally called "red rust". Red rust is sparse
Loose, very easy to melt, unable to maintain the steel surface, do not re etch, to promote the corrosion of steel has been carried out until it is completely etched, it is the characteristics of steel. Because of this, steel must rely on the surface coating of other metal materials or metal material protective layer thickness, in order to reasonably avoid steel corrosion

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