Addition of 1.5 to 3 percent sodium chromate by dry weight to tissue paper used for interleaving aluminum sheets packed unoiled effectively controls water staining, experiments by C. C. Lacy and E. W. Everhart of the Kaiser Aluminum and Chemical Corporation Division of Metallurgical Research show.
Water staining has been a particular problem of the aircraft industry where quantities of aluminum sheets are stored. While discoloration of the surface is important from the standpoint of appearance. Kaiser’s investigations did not indicate it significantly affected the strength of the material. Alloys tested were 3S and 24S-F.
The development is protected by patents.
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