Investigations of Phosphate Coatings of Galvanized Steel Sheets by a Surface-Analytical Multi-Method Approach
Year after year, monetary amounts reaching thousands of millions are lost by corrosion. In the Federal Republic of Germany alone, costs due to corrosion rose to 4 × 1010 DM during the past year1. Great exertions are made by manufacturers, all of which with one solitary aim, to develop improved protection methods against corrosion. Widely used protection coatings for steel sheets are produced by electro-galvanizing, phosphatizing and passivation by chromatizing of the surface2. Steel sheets coated in this manner may be converted, soldered and welded without any difficulty. The phosphate coating makes for an excellent adhering base for varnishing and enameling paints which can be applied without any additional treatment. They find use in household and electrical supplies, in automobile and building industries. The macroscopic properties of the corrosion-protective coatings depend to a great extent upon the details of the layer structure. In order to optimize the specific kind and the homogeneity of this layer structure, and in order to avoid faults, the demand for analytical investigations is stringent. Such investigations have been carried out with several surface-analytical methods. Our strategy here is to carry out synergetic investigations according to a multi-method concept. Further multi-method approaches to the analysis of surface layers of steel makings have been presented by Ebel and Wernisch3, Gettings and Kinloch4, Janssen5, Kool, Mittemeijer, and Schalkoord6, Vetters, Hoffmann, and Schaaber7, and Wakano and Usuki8. SCHAABER7, and WAKANO and USUKI8.
KeywordsSteel Sheet Phosphate Coating Phosphate Layer Glow Discharge Optical Emission Spectroscopy Depth Profile Analysis
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