The stability of mixed dispersions containing a PVC latex and rod-like FeOOH particles has been studied as a function of pH and the addition of various electrolytes. It was shown that the mixed system was dominated by the properties of the ferric oxyhydroxide, i. e. in most cases heteroflocculation took place under conditions which brought about destabilization of the pure ~FeOOH sol.
Three new types of corrosion-resistant steel sheets for automotive body panels have been developed. 1) Zinc-nickel alloy electroplated steel sheet 2) Two-layer zinc-iron alloy electroplated steel sheet 3) Organic composite-coated steel sheet With their protective coating alloyed, applied in two layers or composited, these corrosion-resistant steel sheets have excellent corrosion resistance and paintability for relatively low coating weight. Their formability, weldability and other properties are also balanced well. This report mainly describes the development concept and quality performance of each of the new types of corrosion-resistant sheets.
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