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你知道什么是彩钢瓦的热镀锌工艺吗?

来源:http://www.jnqkgjg.com 日期:2018-12-27 发布人:admin

彩钢瓦是一种新型的建筑材料,在运用的时分,因为它的功能优势,被许多厂家喜爱,那么关于这种产品的常识,我们了解多少呢,下面这篇文章为我们详细讲解这种产品的热镀锌工艺,我们一起来了解一下吧。

Coloured steel tile is a new building material. When it is used, it is loved by many manufacturers because of its functional advantages. So how much do we know about the common knowledge of this product? This article will explain the hot-dip galvanizing process of this product in detail for us. Let's get to know it together.
彩钢瓦热镀锌出产工艺:
Production process of hot-dip galvanizing for color steel tile:
清洗:较一般热镀锌产品出产而言,铝锌合金镀层彩钢瓦的出产对基板清洁度有更加严厉的要求。这是因为热镀铝锌合金时,镀液铝含量较高、镀液温度较高、铝易氧化、易发生锌蒸汽,然后易恶化镀层附着性。
Cleaning: Compared with the production of general hot-dip galvanized products, the production of Al-Zn alloy coated color steel tile has more stringent requirements on the cleanliness of the substrate. This is because when hot-dip Al-Zn alloy, the content of Al in plating solution is higher, the temperature of plating solution is higher, Al is easy to oxidize, zinc vapor is easy to occur, and then the adhesion of plating layer is easy to deteriorate.
因此,为保证镀层粘附性,热镀铝彩钢瓦出产一般需采用炉外清洗,即在退火炉前设置电解脱脂清洗段。
Therefore, in order to ensure the adhesion of coatings, hot-dip aluminized color steel tile production generally needs to be cleaned outside the furnace, that is, electrolytic degreasing cleaning section is set before the annealing furnace.
退火:热镀锌彩钢瓦的退火与一般热镀锌板相比有两个问题需考虑:一是对彩钢如何实现在线过时效处理,因其过时效的最佳温度为300~350℃,而带钢入锌锅温度要求大于550℃;二是因为其镀液温度比锌的熔点高出200℃左右,易引起炉鼻处锌的蒸腾,这种锌蒸汽附着在带钢上,就会使产品发生漏镀缺陷。
Annealing: Compared with ordinary hot-dip galvanized sheet, the annealing of hot-dip galvanized color steel tile has two problems to be considered: one is how to realize on-line over-aging treatment of color steel, because the optimum temperature of over-aging is 300-350 C, and the temperature of strip entering galvanizing pot is more than 550 C; the other is that the temperature of galvanizing bath is about 200 C higher than the melting point of zinc, which easily causes the transpiration of zinc at the nose of the furnace, and this kind of zinc VA Leakage plating defects will occur on strip steel.
因此需保证炉内强的复原性气氛和严厉控制炉鼻处的零点温度。鉴于此,国外一些出产厂家将炉内H2含量进步到了40%~60%,炉鼻处的零点温度控制在-50℃以下。
商河彩钢瓦
Therefore, it is necessary to ensure a strong restorative atmosphere in the furnace and strictly control the zero temperature at the nose of the furnace. In view of this, some foreign producers have increased the H2 content in the furnace to 40%-60%, and the zero temperature at the nose of the furnace is controlled below - 50 C.
热镀:因为Al-Zn合金熔点较高,故其镀液温度比一般热镀锌温度高,最佳温度规模为620~650℃。为取得较好的镀层附着性,带钢入锌锅温度要比镀液温度低约50℃。
Hot-dip galvanizing: Because of the high melting point of Al-Zn alloy, the bath temperature is higher than that of general hot-dip galvanizing. The optimum temperature range is 620-650 C. In order to obtain better adhesion of the coating, the temperature of the strip entering the zinc pot is about 50 C lower than that of the bath.
为了细化富铝的枝晶安排,削减枝晶间富锌的晶粒的体积分数,以进步镀层耐蚀性(富铝枝状晶细小、晶间的空隙小,枝晶间富锌的晶粒要少、且细密地涣散在镀层中),镀后需求快速冷却,冷却速度一般要求10~30℃/s。
In order to refine the dendrite arrangement and reduce the volume fraction of zinc-rich grains between dendrites in order to improve the corrosion resistance of the coatings (fine dendrites, small interstitial voids, small zinc-rich grains between dendrites, and fine dispersed in the coatings), rapid cooling after plating is required, and the cooling rate generally requires 10-30 C/s.
镀后处理:与一般热镀锌相同,彩钢板一般也进行铬酸钝化后处理。但近年来,为进步彩钢板的成形性及环保性,将辊涂丙稀酸工艺开始逐步替代传统的铬酸钝化,且无铬有机钝化逐步受到广泛重视。
After-treatment: Like hot-dip galvanizing, color steel plate is also passivated by chromic acid. However, in recent years, in order to improve the formability and environmental protection of color steel plate, the roll-coated acrylic acid process has gradually replaced the traditional chromatic acid passivation, and the chromium-free organic passivation has gradually received widespread attention.
经过以上的内容,我们可以大体了解到彩钢瓦的热镀锌工艺,此外,因其外表较一般热镀锌板洁净,且对预处理较灵敏,预清洗过度,会导致镀层外表变黑,降低涂层粘附性,所以其预处理要求要温和些。
Through the above content, we can generally understand the hot-dip galvanizing process of color steel tile. In addition, because its appearance is cleaner than that of ordinary hot-dip galvanized sheet, and it is more sensitive to pretreatment and excessive pre-cleaning, it will cause the coating surface to become black and reduce the adhesion of the coating, so its pretreatment requirements are milder.
以上信息是我们商河彩钢瓦整理发布希望对大家以后的生活有所帮助我们的网站是:http://www.jnqkgjg.com
The above information is our Shanghe color steel tile collation and release hope to help you in the future life of our website is: http://www.jnqkgjg.com!