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镀锌方管产生气泡的条件

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【 发布于:2018-03-19 11:50:57 】


目前常见的镀锌方管的生产工艺是有两种,分别是热镀锌方管和冷镀锌方管,这两种工艺有哪些不同之处呢?今天济南镀锌管厂家的小编带我们一起了解下镀锌管产生气泡的原因吧。

At present, there are two common methods for producing galvanized square tubes, which are hot-dip galvanized and cold galvanized square tubes. What are the differences between the two processes? Today, the small editor of the galvanized pipe manufacturer in Ji'nan brings us together to understand the reason why the galvanized pipe produces bubbles.

由于熔体中的气体以气泡析出具备三个条件:一是溶解的气体处于过饱和状态;二是气泡内各种气体分压之和大于作用于气泡的外压力;三是有大于临界的气泡核。在实际铸造条件下,由于熔体中总是存在着大量非金属夹杂物、结合体和精炼时未逸出的气泡,因此熔体中的非自发气泡核很容易形成。

济南镀锌管

Because the gas in the melt precipitates with bubbles, there are three conditions: first, the dissolved gas is in a supersaturation state; the two is the sum of the partial pressure of various gases in the bubble is greater than the external pressure acting on the bubble, and the three is the bubble core larger than the critical value. Under the actual casting conditions, there is always a large number of nonmetallic inclusions, binding bodies and unescaped bubbles in the melt, so the non spontaneous bubble nuclei in the melt are easy to form.

另外,济南镀锌管经过炼后的熔体,含氢量虽然低于平衡浓度,但在凝固过程中的气体浓度再分配结,使结晶前沿的液体中造成局部氢含量的过饱和,因而为镀锌管形成气泡创造了有利条件。当结晶前沿液体中的氢分压增大到大于外部压力时,便可能形成气泡。

In addition, Ji'nan galvanized pipe through the melt mixing, the hydrogen content was lower than the equilibrium concentration, but the gas concentration redistribution in the solidification process of the node, causing local hydrogen content in the liquid crystal front supersaturation, and galvanized pipe forming bubbles created favorable conditions. When the hydrogen partial pressure in the crystalline front liquid increases to greater than the external pressure, it may form a bubble.

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