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減少靜電噴涂工藝中存在的隱患

作者: 來源: 日期:2022/2/5 9:18:29

      減少云南橋架靜電噴涂工藝中存在的隱患,嘗試各種方式研究和實驗后,終于發現了一種可行方法——雙重防腐蝕方法——電鍍鋅(經純化)+粉末靜電噴涂。把需要進行粉末靜電噴涂的工件,首先按照電鍍鋅的工藝要求以及質量要求進行電鍍鋅以及純化處理,然后進行粉末靜電噴涂。但是不能電鍍鋅和純化后的工件直接進行粉末靜電噴涂,因為這樣會產生如下的問題。云南橋架廠.jpg

        第一圖層在工件表面(即電鍍層的表面)附著力不均勻,不穩定,局部受外力會產生小片狀脫離,嚴重的時候會自動脫落。

        第二表面會局部產生微粒狀物(已經排除粉末含雜質)表面不夠光滑;

        第三圖層局部產生泡和針孔

         以上這些缺陷都是粉末靜電噴涂質量要求中不允許存在,經過半年的研究實驗,找出原因是:鋼制件的電鍍鋅以及純化處理過程中,在工件表面會留存有機質化學放映中殘留物質,當把帶靜電的粉末噴涂到這些工件表面后,送進爐中,升溫160℃,保溫15分鐘進行固化處理時,這些殘留物質會析出與粉末反應而產生以上的缺陷。

To meet the need to reduce the hidden dangers in the electrostatic spraying process of Yunnan bridge, after trying all kinds of research and experiments, we finally found a feasible method -- double anti-corrosion method -- electrogalvanizing (purified) + powder electrostatic spraying. The need for powder electrostatic spraying of the workpiece, first in accordance with the process requirements and quality requirements of electrogalvanizing and purification treatment, and then powder electrostatic spraying. However, electrogalvanizing and purified workpiece can not be directly powder electrostatic spraying, because this will produce the following problems.

The first layer on the surface of the workpiece (that is, the surface of the electric coating) adhesion is not uniform, unstable, local external force will produce small flake detachment, serious will automatically fall off.

The second surface will locally produce particles (impurities in the powder have been excluded) the surface is not smooth;

The third layer produces bubbles and pinholes locally

These defects are not allowed in the quality requirements of powder electrostatic spraying. After half a year of research and experiment, the reasons are found: Electric galvanized, purification treatment process of steel pieces, will be retained in workpiece surface residual material in organic chemical screening, when the belt after the electrostatic powder coating to the surface, into the furnace, the temperature of 160 ℃, the heat preservation for 15 minutes during curing process, these residual substances will precipitate reaction with powder and produce the above defects.云南橋架的副本.jpg

        為了排除云南橋架廠家生產過程中這些原因需要做如下的處理:在進行粉末狀靜電噴涂前,把經過電鍍鋅和純化處理的鋼制件送進烘爐升溫到200℃2小時出爐,自然冷卻到室溫。噴涂前,用布把工件表面抹一次,在按照規范進行粉末靜電噴涂操作,就能得到表面光滑而且附著力好的防腐層。這樣,在噴涂層與鋼制件之間就會有一層鋅存才,也是鋼制加的一層防腐層,再不會形成氧化鐵銹。如果在運輸或者安裝過程中產生了碰撞,點了一點噴涂層以后,露出的是表面有一層鈍化膜的鋅層,任然能夠起到防腐蝕作用。



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