本文選題：熱基鍍鋅　切入點：鋅層　出處：《華北理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：本文采用OM、SEM、EDS等檢測分析手段,研究了唐鋼熱基熱鍍鋅產(chǎn)品形成凹坑、黑斑、脫鋅、鈍化等缺陷的原因,提出了解決這些缺陷的措施,通過優(yōu)化熱基鍍鋅生產(chǎn)線的生產(chǎn)工藝,獲得了涂鍍性能良好的熱基熱鍍鋅產(chǎn)品,滿足了高端用戶的要求。得出的主要結(jié)論如下:凹坑缺陷形狀極為規(guī)則,不具有周期性并且間歇性出現(xiàn)在鍍層表面上,而且形狀也極為相似,主要是由于機(jī)械劃傷或是枝晶結(jié)晶速度以及形成的時間不同造成的。黑斑的直徑大約400μm,缺陷處的枝晶組織有被摩擦或壓扁的痕跡,缺陷部分比正常部分凸起高,使其壓下量大于周圍位置,從而產(chǎn)生了黑斑缺陷。亮斑的高度與周圍稍有差別,比周圍稍高,但與試樣鍍層的黑斑缺陷相比,又低于形成黑斑缺陷的凸起高度,形成亮斑的原因可能是鋅液中形成的某種鋁或鋅的氧化物。優(yōu)化了連續(xù)熱鍍鋅生產(chǎn)工藝,包括降低帶鋼入鋅鍋溫度,適當(dāng)降低并控制鋅液溫度穩(wěn)定性,降低鋅液中Fe含量,增加帶鋼鍍后冷卻速率等。優(yōu)化后的鋅層中合金層明顯減薄,鋅層與基體結(jié)合處C、O含量明顯減少,Al抑制層愈靠近鋅層,限制了Fe向鋅層擴(kuò)散,顯著提高了鋅層的粘附性,顯著降低了各類缺陷的產(chǎn)生。通過研究改良森吉米爾法爐內(nèi)氛圍及還原氧化的影響,優(yōu)化了帶鋼溫度梯度以及NOF爐內(nèi)空氣過剩系數(shù)等相關(guān)聯(lián)參數(shù),并充分利用通入高氫給爐內(nèi)的方法,成功解決了氧化還原和鋅層粘附性差的難題。
[Abstract]:In this paper, the causes of the defects such as pits, black spots, dezincification and passivation in hot base galvanizing products of Tangshan Iron and Steel Co., Ltd are studied by means of OMZEMs and EDS. The measures to solve these defects are put forward, and the production process of hot base galvanizing production line is optimized. The hot base hot-dip galvanizing product with good coating performance is obtained, which meets the requirements of high-end users. The main conclusions are as follows: the shape of pit defects is very regular, does not have periodicity and appears intermittently on the surface of the coating. And the shape is very similar, mainly due to mechanical scratches or different rates of dendritic crystallization and the time of formation. The diameter of black spots is about 400 渭 m, and the dendritic structure at the defects shows signs of being rubbed or flattened. The defect part is higher than the normal part, so that the reduction is larger than the surrounding position, which results in the black spot defect. The height of the bright spot is slightly different from the surrounding, slightly higher than the surrounding, but compared with the black spot defect of the sample coating, The cause of the bright spot may be some kind of aluminum or zinc oxide formed in the zinc solution. The continuous hot dip galvanizing process has been optimized, including lowering the temperature of the strip steel into the zinc pot, Decreasing and controlling the temperature stability of zinc solution, decreasing Fe content in zinc solution, increasing cooling rate of strip after plating, etc. The alloy layer in the optimized zinc layer is obviously thinned, and the content of Con O in the zinc layer at the interface between zinc layer and substrate is obviously reduced, and the inhibition layer of Al is closer to the zinc layer. The diffusion of Fe to zinc layer was limited, the adhesion of zinc layer was improved significantly, and the production of various defects was significantly reduced. The effect of modified Zenjimir process on the atmosphere and reduction and oxidation of zinc layer was studied. The temperature gradient of strip steel and the air excess coefficient in NOF furnace were optimized and the problems of redox and poor adhesion of zinc layer were solved by fully utilizing the method of high hydrogen feed furnace.
【學(xué)位授予單位】：華北理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG174.4

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李九嶺;李守華;張雨泉;;帶鋼連續(xù)熱鍍鋅的發(fā)展趨勢[J];武鋼技術(shù);2010年06期

2 干治江;;熱鍍鋅板光整花缺陷的成因分析[J];軋鋼;2010年03期

3 于世川;李一棟;梁振威;潘韶慧;楊青;王迎春;;唐鋼熱鍍鋅線退火板生產(chǎn)實踐[J];軋鋼;2009年06期

4 Tae-Seok CHO;Young-Doo KWON;Soon-Bum KWON;;A Study of the Influence of Air-knife Tilting on Coating Thickness in Hot-dip Galvanizing[J];Journal of Thermal Science;2009年03期

5 ;Corrosion behavior and mechanism of the automotive hot-dip galvanized steel with alkaline mud adhesion[J];International Journal of Minerals Metallurgy and Materials;2009年04期

6 李九嶺;汪曉林;柯江軍;;從對脫脂認(rèn)識看帶鋼連續(xù)熱鍍鋅技術(shù)的發(fā)展[J];軋鋼;2009年03期

7 馬軍;;鍍鋅生產(chǎn)線退火爐燃燒控制的應(yīng)用分析[J];四川冶金;2009年02期

8 ;Role of silicon in steels on galvanized coatings[J];Acta Metallurgica Sinica(English Letters);2009年02期

9 耿須照;;寶菱重工3~#熱鍍鋅工藝段簡介[J];現(xiàn)代冶金;2009年02期

10 張海尉;;熱鍍鋅機(jī)組鋅鍋有效鋁含量精確控制技術(shù)[J];寶鋼技術(shù);2009年01期

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