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镀锌角钢表面粗糙是什么原因? 

来源:http://www.jnlhjscl.com/ 日期:2020-11-12 发布人:adminlehao

表面粗糙的镀锌层通常比光滑的镀锌层更厚,因而耐腐蚀的寿命可能更长,只是外观不佳而已,一般情况下这种缺陷是可以接受的。因此,也不宜作为拒收的质量原因。
Rough zinc coating is usually thicker than smooth zinc coating, so the corrosion resistance life may be longer, but the appearance is poor, and this kind of defect is generally acceptable. Therefore, it should not be used as a quality reason for rejection.
镀锌层表面粗糙度,是指镀锌层表面较小间距和微观峰谷不平度的微观几何特性。目前采用的方法有光学法、比较法、针描法和印模法等多种。
The surface roughness of zinc coating refers to the micro geometric characteristics of small spacing and micro peak valley unevenness of zinc coating surface. At present, optical method, comparison method, needle tracing method and impression method are used.
造成角钢镀锌层表面粗糙缺陷的主要原因如下:
The main reasons for surface roughness of galvanized coating of angle steel are as follows:
一、镀前处理过程中产生“过酸洗”,对角钢镀锌层表面粗糙的影响。
1、 The effect of "over pickling" on the surface roughness of zinc coating of diagonal steel is produced in the process of pretreatment.
“过酸洗”使钢材表面粗糙或产生豆痕,这也是工件热镀锌后表面粗糙的原因之一。
"Over pickling" makes the steel surface rough or produce bean marks, which is one of the reasons for the surface roughness of the workpiece after hot galvanizing.
                                                             济南角钢
二、锌液温度过高或浸锌时间过长,对角钢镀锌层表面粗糙的影响。
2、 The effect of too high temperature or too long time of zinc dipping on the surface roughness of zinc coating on diagonal steel is studied.
锌液温度过高、浸锌时间过长时,或由于角钢成分及圣德林效应的影响,使Zn-Fe合金相生成过多或不均匀,也会造成表面粗糙。镀锌层越厚表面越容易显得粗糙。
When the temperature of liquid zinc is too high, the time of zinc dipping is too long, or because of the influence of angle steel composition and Sandrine effect, too much or uneven phase of Zn Fe alloy will be formed, and the surface roughness will also be caused. The thicker the zinc coating, the rougher the surface is.
热镀锌角钢从锌液中取出后冷却缓慢,或钢材截面太厚,或热镀锌后角钢不加隔离立即叠放等原因,也会出现表面粗糙现象。
The surface roughness of hot-dip galvanized angle steel may also appear due to slow cooling after being taken out of the liquid zinc, or the steel section is too thick, or the angle steel is immediately stacked without isolation after hot-dip galvanizing.
三、角钢制造选用钢材的成分或表面条件,对角钢镀锌层表面粗糙的影响。
3、 The influence of composition or surface condition of steel used in angle steel manufacturing on the surface roughness of zinc coating of diagonal steel.
镀锌层表面的光滑与粗糙,是相对而言的。与钢板、钢管或钢丝的“连续热镀锌”不同,钢铁角钢热镀锌属于批量热镀锌工艺范畴,镀锌层不经气刀吹抹。若热镀锌角钢所用钢材表面原本就粗糙不平、有锈蚀坑或明显的轧制条纹,热镀锌完成后,其表面一般不会比原先更平整光滑。
The smoothness and roughness of zinc coating surface are relative. Different from "continuous hot galvanizing" of steel plate, steel pipe or steel wire, hot galvanizing of steel angle steel belongs to the category of batch hot galvanizing process, and the zinc coating is not blown and wiped by air knife. If the surface of the steel used for hot-dip galvanized angle steel is rough and uneven, with rust pits or obvious rolling stripes, the surface of hot-dip galvanized angle steel will not be smoother than before.
钢材中的成分也会因圣德林效应影响到Zn-Fe合金相层的生成过多或不均,造成表面粗糙。
The composition of the steel will also affect the formation of Zn Fe alloy phase layer due to the Sandrine effect, resulting in the surface roughness.



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