Abstract

The phosphating of steel in an aqueous zinc-phosphating bath has been studied. Phase formation was controlled poentiostatically and phase identification was performed by X-ray diffraction, using synchrotron radiation, which enabled the time development of phosphate coatings to be studied. Two phases are formed during the phosphating process: hopeite and phosphophyllite, the diffraction patterns of which resemble those obtained from mineral standards. At potentials more negative than 0.6 V vs SCE a pure hopeite phase is formed

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