Abstract: A method of producing oxide ceramic layers on Al, Mg, Ti, Ta, Zr, Nb, Hf, Sb, W, Mo, V, Bi or their alloys by a plasma-chemical anodical oxidation in a chloride-free electrolytic bath having a pH value of 2 to 8 and a constant bath temperature of -30.degree. to +15.degree. C. A current density of at least 1 A/dm.sup.2 is maintained constant in the electrolytic bath until the voltage reaches a predetermined end value.

Abstract: A method of producing composite oxide ceramic fluorine polymer layers on articles of aluminum, magnesium, titanium or their alloys, particularly of light metal components, includes introducing particles of fluorine polymers into the capillary system of an oxide ceramic layer. The particles have a particle size which at least in one dimension is smaller than the diameter of the capillaries. The article is then subjected to alternating pressure conditions.

Abstract: A method of producing oxide ceramic layers on Al, Mg, Ti, Ta, Zr, Nb, Hf, Sb, W, Mo, V, Bi or their alloys by a plasma-chemical anodical oxidation in a chloride-free electrolytic bath having a pH value of 2 to 8 and a constant bath temperature of -30.degree. to +15.degree. C. A current density of at least 1 A/dm.sup.2 is maintained constant in the electrolytic bath until the voltage reaches a predetermined end value.

Abstract: A method of producing protective coatings that are resistant to corrosion and wear on magnesium and magnesium alloys by anodic oxidation. In order to obtain coatings that have little or no inherent color, that can be easily colored, and that provide a satisfactory adhesive base for lacquering or subsequent processing, a low-alkali aqueous electrolyte bath containing(a) borate or sulfonate anions and(b) phosphate and fluoride or chloride ionsand adjusted to a pH of 5 to 11 and preferably 8 to 9 is employed. A direct current is applied and is either briefly turned off or its polarity incompletely reversed to allow the formation of manganese phosphate and magnesium fluoride or magnesium chloride and optionally magnesium aluminate.

Abstract: A method of preparing the surfaces of magnesium and magnesium alloys by anodic oxidation. To produce protective coatings that have little or no inherent color, that can easily be colored, that provide a satisfactory adhesive base for lacquering or subsequent processing, and that exhibit outstanding resistance to corrosion and wear on magnesium and magnesium alloys by anodic oxidation, an alkali-rich aqueous electrolyte bath containing(a) borate or sulfonate anions and(b) phosphate and fluoride or chloride ionsand adjusted to a pH of 8 to 12 and preferably 10.5 to 11.5 is employed. A direct current is applied and is either briefly turned off or its polarity incompletely reversed to allow the formation of magnesium phosphate and magnesium fluoride or magnesium chloride and optionally magnesium aluminate.

Abstract: A method and apparatus for electroless plating of a metal on a workpiece overcomes the problem of metal plating on solid particles suspended in the solution and on those parts of the plating apparatus in contact with the solution by maintaining a concentration of anticatalytic substance, such as lead ions, between about 10.sup.-.sup.6 and 10.sup..sup.-1 mols per liter and maintaining a relative speed of more than about 0.9 meter per second between the solution and those parts of the apparatus in contact with the solution.