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達克羅噴塗的優缺點有哪些—達克羅自動化噴塗機

返回列表 作者：鵬鲲達克羅自動化噴塗機编辑： 400-088-0769/18025258586 来源： www.pk316.com 发布日期： 2020.10.14

达克罗噴塗設備的優點：超強的耐蝕性能:達克羅膜層的厚度僅爲4-8μm，但其防鏽效果卻無鉻達克羅是傳統電鍍鋅、熱鍍鋅或塗料塗覆法的7-10倍以上。采用達克羅工藝處理的標准件、管接件經耐鹽霧試驗1200h以上未出現紅鏽。無氫脆性:達克羅的處理工藝決定了達克羅沒有氫脆現象，所以達克羅非常適合受力件的塗覆。高耐熱性:達克羅可以耐高溫腐蝕，耐熱溫度可達300℃以上。而傳統的鍍鋅工藝，溫度達到100℃時就已經起皮報廢了。

達克羅塗層與金屬基體有良好的結合力，而且與其他附加塗層有強烈的粘著性，處理後的零件易于噴塗著色，與有機塗層的結合力甚至超過了磷化膜。良好的滲透性:由于靜電屏蔽效應，工件的深孔、狹縫，管件的內壁等部位難以電鍍上鋅，因此工件的上述部位無法采用電鍍的方法進行保護。達克羅則可以進入工件的這些部位形成達克羅塗層。

達克羅自動化噴塗無汙染和公害，在生産加工及工件塗覆的整個過程中，不會産生對環境有汙染的廢水廢氣，不用三廢治理，降低了處理成本。

達克羅噴塗雖然有許多優點，但它也有一些不足之處，主要體現爲:部分達克羅中含有對環境和人體有害的鉻離子，尤其是六價鉻離子具有致癌作用。(在目前的環保政策下，現在的達克羅中已不含六價鉻離子)達克羅的燒結溫度較高、時間較長，能耗大。達克羅的表面硬度不高、耐磨性不好，而且達克羅塗層的制品不適合與銅、鎂、鎳和不鏽鋼的零部件接觸與連接，因爲它們會産生接觸性腐蝕，影響制品表面質量及防腐性能。達克羅塗層的表面顔色單一，只有銀白色和銀灰色，不適合汽車發展個性化的需要。不過，可以通過後處理或複合達克羅塗層的導電性能不是太好，因此不宜用于導電連接的零件。

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