本文選題：冷軋鋼　切入點：磷化膜　出處：《河南師范大學》2015年碩士論文

【摘要】：冷軋鋼板因具有良好的性能,被廣泛用于家電、汽車、工業(yè)設備和工程機械的制造中。但冷軋鋼在應用過程中容易腐蝕,常需對其進行表面處理以延長使用壽命。在傳統(tǒng)的表面處理技術中,磷化是一種重要的防腐蝕技術。常溫快速磷化處理技術因克服了中高溫磷化能耗高、成本大的特點,成為目前研究較為活躍的一種技術,受到普遍關注。隨著社會的發(fā)展,節(jié)能環(huán)保已成為當前趨勢,因此綠色環(huán)保的冷軋鋼表面硅烷化處理技術成為一項有意義的研究。本文研究了在冷軋鋼表面制備常溫磷化膜和硅烷膜的工藝條件,以及添加稀土化合物對硅烷膜性能的改性作用。應用極化曲線、硫酸銅點滴試驗測試制備膜層的耐腐蝕性能,鹽水全浸泡測試對其與有機涂層間的結合力進行評價,掃描電子顯微鏡(SEM)對膜層的表面形貌進行表征。以硫酸銅點滴變色時間為指標,通過正交試驗的方法確定了磷化液的最優(yōu)配方。應用極化曲線和硫酸銅點滴實驗的方法,通過單因素實驗法測試了酸比、浸漬時間和磷化溫度對磷化膜性能的影響并確定最佳工藝條件。在冷軋鋼表面制備雙-(γ-三乙氧基硅基丙基)四硫化物(商品名:Si-69)硅烷膜,采用極化曲線的方法,通過單因素實驗法確定了Si-69溶液的配制方法。應用極化曲線和硫酸銅點滴實驗的方法,通過單因素實驗法測試浸泡時間、固化時間和固化溫度對硅烷膜性能的影響,確定最佳工藝條件。將最佳工藝條件下制備的磷化膜和Si-69硅烷膜與空白冷軋鋼進行性能對比。極化曲線和硫酸銅點滴試驗結果顯示:磷化膜和Si-69硅烷膜顯著的增強了冷軋鋼的耐腐蝕性能,但Si-69硅烷膜的耐蝕性能優(yōu)于磷化膜。鹽水全浸泡實驗顯示磷化膜和Si-69硅烷膜都增強了基體與有機涂層間的結合力,但Si-69硅烷膜對結合力的增強作用大于磷化膜。掃描電子顯微鏡(SEM)顯示空白冷軋鋼表面有劃痕和坑洞;磷化膜表面呈現(xiàn)出凹凸不平并有少量空隙的片狀結構;Si-69硅烷膜表面較磷化膜為平整,有一些線型凸起。為進一步提高硅烷膜的性能,探索了于Si-69溶液中添加稀土氯化物,在冷軋鋼表面制備稀土改性硅烷膜的方法。選用CeCl3、YCl3、LaCl3作為添加物。采用極化曲線測試的方法,得到不同稀土氯化物的改性硅烷膜耐腐蝕性能最佳時添加稀土氯化物的量,此為稀土氯化物添加量的最優(yōu)參數(shù)。用最優(yōu)參數(shù)下制備的稀土改性硅烷膜與Si-69硅烷膜進行對比,極化曲線和硫酸銅點滴實驗顯示稀土改性硅烷膜耐腐蝕性能優(yōu)于Si-69硅烷膜。鹽水全浸泡實驗顯示,稀土改性硅烷膜對金屬基體與有機涂層間的結合力增強作用大于Si-69硅烷膜。掃描電子顯微鏡(SEM)顯示稀土改性硅烷膜的表面呈現(xiàn)均勻致密的結構,表面十分平整。
[Abstract]:Cold-rolled steel plate is widely used in the manufacture of household appliances, automobiles, industrial equipment and construction machinery because of its good performance.However, cold rolled steel is easy to corrode during application, and surface treatment is often needed to prolong its service life.Phosphating is an important anticorrosive technology in traditional surface treatment technology.Because of overcoming the characteristics of high energy consumption and high cost, the rapid phosphating technology at room temperature has become an active technology, which has been paid more attention to.With the development of society, energy saving and environmental protection have become the current trend, so the silane treatment technology of green cold rolled steel surface has become a meaningful research.In this paper, the process conditions of preparing phosphating film and silane film at room temperature on the surface of cold rolled steel were studied, and the modification effect of rare earth compound on the properties of silane film was also studied.The corrosion resistance of the film was tested by polarization curve and copper sulfate drop test. The adhesion between the film and the organic coating was evaluated by salt water immersion test. The surface morphology of the film was characterized by scanning electron microscope (SEM).The optimum formula of phosphating solution was determined by orthogonal test with copper sulfate drop discoloration time as index.The effects of acid ratio, impregnation time and phosphating temperature on the properties of phosphating film were determined by single factor experiment with polarization curve and copper sulfate drop test.Double (緯 -triethoxysilyl propyl) tetrasulfide (commercial name: W Si-69) silane film was prepared on the surface of cold-rolled steel. The preparation method of Si-69 solution was determined by polarization curve method and single factor experiment method.The effects of soaking time, curing time and curing temperature on the properties of silane film were measured by polarization curve and cupric sulfate drip test, and the optimum technological conditions were determined.The properties of phosphating film and Si-69 silane film prepared under the optimum technological conditions were compared with blank cold rolled steel.The results of polarization curve and copper sulfate drop test showed that the corrosion resistance of cold rolled steel was significantly enhanced by phosphating film and Si-69 silane film, but the corrosion resistance of Si-69 silane film was better than that of phosphating film.The salt water immersion experiments showed that both the phosphating film and the Si-69 silane film enhanced the adhesion between the substrate and the organic coating, but the enhancement effect of Si-69 silane film was greater than that of the phosphating film.Scanning electron microscopy (SEM) showed that there were scratches and holes on the blank cold-rolled steel surface, while the surface of the phosphating film was flat and had some linear protrusions.In order to further improve the properties of silane film, the method of preparing rare earth modified silane film on cold rolled steel surface by adding rare earth chloride in Si-69 solution was explored.CeCl _ 3 YCL _ 3 LaCl _ 3 was used as additive.The amount of rare earth chloride was obtained when the corrosion resistance of the modified silane film with different rare earth chlorides was the best by means of polarization curve test, which was the best parameter for adding rare earth chloride.The results of polarization curves and copper sulfate drop experiments show that the rare earth modified silane film has better corrosion resistance than that of Si-69 silane film.The results of saltwater immersion showed that the bonding strength of rare earth modified silane film was greater than that of Si-69 silane film.Scanning electron microscopy (SEM) showed that the surface of rare earth modified silane film was uniform and compact, and the surface was very smooth.
【學位授予單位】：河南師范大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG174.4

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