C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/83 (2006.01) C23C 22/60 (2006.01)
Patent
CA 2041892
In a process of forming conversion coatings on surfaces of zinc and zinc alloys, in which the surfaces are contacted in a first stage with a solution which contains at least two different polyvalent metal ions and also contains such an amount of complexing agent that the polyvalent metal ions are kept in solution, and which has a pI3 value of,at least 11, and the surfaces are treated in a succeeding stage with a post rinsing solution, a succeeding stage comprises a treatment with a post rinsing solution which contains aluminum, zirconium and fluoride and has been adjusted to a pH value not in excess of five. According to desirable features of the process the total concentration of Al + Zr + F is adjusted to a value between 0.1 and 8.0 g/l, preferably between 0.2 and 5.0 g/l, and the Al : Zr : F mole ratio is adjusted to (0.15 to 8.0) : 1 : (5 to 52) or to (0.15 to 0.67) : 1 : (5 to 7). The treatment is suitably carried out for 1 to 120 seconds preferably 1 to 30 seconds, and at a temperature of 20 to 80°C, preferably 20 to 50°C. The process can desirably be used for a pretreatment before a succeeding painting, film laminating or adhesive coating operation.
Kolberg Thomas
Rausch Werner
Schubach Peter
Wendel Thomas
Chemetall Gmbh
Metallgesellschaft Aktiengesellschaft
Robic
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