Corrosion retardant layer production, involves handling surface of molded body with aqueous, fluor

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The invention relates to a method for producing a corrosion-inhibiting layer on a former in physiological environment, which comprises an yttrium and other rare earth-containing, as a medical implant or a component part of a magnesium alloy and biocorrodible medical implant is formed. The method comprises the step : treating a surface of the shaped body with an aqueous, fluoride-containing conversion solution.