Development of the Eco-Friendly Chromium-Free Lubricating Coating on the Galvanized Steel Sheet

by Jung-Hsiung Shen, Hung-Ping Wang

Publisher - China Steel Corp., Taiwan, R.O.C.

Category - Engineering & IT

In view of the global trend of environment protection and in order to satisfy customer needs, China Steel Corporation (CSC) is committed to developing eco-friendly nonchromate lubricating coating “UL” (U: Universal; L: Lubrication) which is applied to the galvanized steel sheet for applications such as electrical appliances, sliding rails, vending machines, etc. The UL coated galvanized steel sheet as presented here conforms to the requirements of the WEEE and RoHS directives. The UL coating not only meets the quality requirements of customers but also elevates the lubrication ability. The result shows that the coefficient of friction (COF) of the UL coating sustains at the level of 0.08~0.11 even after a hundred times of sliding test which is superior to other coatings. The UL coating also possesses better as-painted adhesion than the commercial chromate coating. The unique performance of the UL coating produces much product differentiation and makes it a niche product which meet customer’s needs.

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