電泳涂裝生產(chǎn)線中電泳漆由于顏料和襯脂凝集，致使電泳漆脫產(chǎn)生麻點、粗粒的現(xiàn)象統(tǒng)稱為顏料凝集,凝集有兩種類型。

The phenomenon of pigment aggregation and coarse particles caused by the coagulation of pigments and lining grease in the electrophoretic coating production line is collectively referred to as pigment aggregation. There are two types of aggregation.

一種是電泳槽液中已產(chǎn)生凝集，在電淋時巳凝集的樹脂顏料粒子受重力的作用，沉積在工件的水平表面上而被漆膜包裹。這類凝集很容易看出，粒子主要出現(xiàn)在水平面的上表面，在垂直面和水平面的下表面很少見。

One type is that the resin pigment particles that have already agglomerated in the electrophoresis bath solution are deposited on the horizontal surface of the workpiece under the action of gravity and wrapped in a paint film during electroleaching. It is easy to see that this type of aggregation mainly occurs on the upper surface of the horizontal plane, while it is rare on the vertical and lower surfaces of the horizontal plane.

另一種凝集是產(chǎn)生在電淋過程中，它與工件的漆前處理不當(dāng)，涂裝條件差等有關(guān)。在電泳涂漆時，顏料大都由樹脂的攜帶面泳涂在工件的表面上，因此顏料的凝集大都與樹脂的凝集有關(guān)。凝集可能由補加的涂料或槽液自身的變化所產(chǎn)生，電淋漆經(jīng)長期存放或儲存的溫度過高，過低(受過冷凍)都可能使原漆溶解不良。在補漆過程中，補給的方法很重要，補加雙組分的陰極電泳漆或低胺的陽極電2求漆時尤其是這樣，因為這二種情況，電泳漆的櫥脂是不完全中和的，在稽液中不易溶解和分散。前者要求將雙組分按比側(cè)混合，后者則要求與槽液混合，經(jīng)過充分攪拌和熟化后再加入槽中。

Another type of condensation occurs during the electric spraying process, which is related to improper pre-treatment of the workpiece and poor painting conditions. In electrophoretic painting, pigments are mostly carried by the resin and applied to the surface of the workpiece, so the aggregation of pigments is mostly related to the aggregation of the resin. Agglomeration may be caused by changes in the added coating or tank liquid itself. After long-term storage or storage at high or low temperatures (subjected to freezing), the original paint may dissolve poorly. During the paint repair process, the method of replenishment is very important, especially when adding two component cathodic electrophoretic paint or low amine anodic electrophoretic paint, because in both cases, the grease of the electrophoretic paint is not completely neutralized and is not easily dissolved and dispersed in the solution. The former requires the two components to be mixed proportionally, while the latter requires mixing with the tank liquid, thoroughly stirring and maturing before being added to the tank.

在電泳稽審也常常產(chǎn)生樹脂和顏料凝聚的現(xiàn)象，產(chǎn)生這種現(xiàn)象的原因可能有三種情況；

In electrophoretic auditing, resin and pigment condensation often occurs, and there are three possible reasons for this phenomenon;

(1)槽液固體分太低，顏料和樹脂的分散襖態(tài)不穩(wěn)定，隨時會從槽液中折出。

(1) The solid content of the tank liquid is too low, and the dispersion of pigments and resins is unstable, which can easily break out of the tank liquid at any time.

(2)槽液的更新期太長(超過半年以上)，由于樹脂的老化、聚合及酸敗而不溶。因此_一般根據(jù)產(chǎn)量計算更新期超過三個月以上，就不推薦采用電泳涂裝。

(2) The update period of the tank liquid is too long (more than half a year), and it is insoluble due to the aging, polymerization, and rancidity of the resin. Therefore_ Generally, if the update period exceeds three months based on production, it is not recommended to use electrophoretic coating.

(3)漆前表面處理不凈、工件表面含有酸或堿類物質(zhì)，都可能在電l泳過程中產(chǎn)生相應(yīng)的中和反應(yīng)而使樹脂顏料異常地沉積在工件表面上因此前處理的水洗，要求反復(fù)沖洗，最后要用去離子水清洗。

(3) Poor surface treatment before painting, as well as the presence of acid or alkali substances on the surface of the workpiece, may cause corresponding neutralization reactions during the electrophoretic process, causing abnormal deposition of resin pigments on the surface of the workpiece. Therefore, repeated washing is required for the pre-treatment, and finally, deionized water is used for cleaning.

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