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馬達用軸承之凡立水生銹原因與對策
馬達用軸承之凡立水生銹原因與對策
凡立水生銹之成因:
馬達內部凡立水揮散出腐蝕性成份與大氣中濕氣被滑脂吸收後侵蝕軸承而生銹(凡立水+濕氣+滑脂)。
凡立水生銹之背景:
全密閉型馬達較常發生,但包裝不當之開放型馬達亦會發生。
開放型馬達包裝以 PE 袋密封易發生。
馬達製造時期 or 庫存期間處於高溫、多濕之環境(如梅雨期到夏季期間,RH70 ~ 80% 生銹最容易發生)。
滑脂之基礎油為合成油時易生銹,礦油、矽油不易生銹。
速乾型之溶劑型凡立水較易生銹。
無溶劑型不易發生(非不會發生)。
凡立水種類及處理條件變更時易發生。
凡立水生銹的特性:
凡立水生銹具有方向性,靠近馬達轉子側之軸承面生銹較多,軸承內部也是面向轉子側之軌道面及保持器較會生銹。
軸承內部反比外部生銹多,尤其在附有滑脂的地方生銹最嚴重。
滑脂會生異味(甚至於惡臭)。
生銹之形態由數μm大之點狀,速成棒狀,再發展為絲狀,最後成為面狀銹。
凡立水銹之防止法,其中以凡立水的改良為最有效,凡立水之改良方式有:
使用無溶劑凡立水。
選擇未含有酸性之溶劑系凡立水。
硬化時間調整:凡立水中造成生銹之成份予以充分揮發,因此低溫長時間要比高溫短時間要好(例如 130℃/3hr 比 150℃/1hr 要好)。
使用未加入揮發性酸成份之凡立水。
其他建議:(若使用的為會揮發性酸成份之凡立水)
凡立水烘乾硬化後,建議擺放於通風環境下,讓多餘的凡立水氣散發完畢,不宜烘乾後隨即組裝成成品。
馬達成品庫存擺放、交貨運輸期間,建議避免出現悶熱、潮濕的環境,以免烘乾之凡立水因為環境影響而再度揮發酸性氣體。
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