DIN 50961 PDF

DIN Electroplated coatings – Zinc coatings on iron or steel – Terms, testing and corrosion resistance (Foreign Standard) This standard only applies in . Buy DIN () Electroplated Coatings – Zinc Coatings On Iron Or Steel – Terms, Testing And Corrosion Resistance from SAI Global. Buy DIN ELECTROPLATED COATINGS – ZINC COATINGS ON IRON OR STEEL – TERMS, TESTING AND CORROSION.

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A general disadvantage of zinc is training voluminous white corrosion products especially in chloride atmosphere. Feuerverzinkte Teile sind chromitierbar.


ZnCrO m 2 taken into account that reaction I by the growing passive layer is increasingly slowed down. As the widespread yellow chromates such. Something different is the situation in the coating of the barrel process. A rating other than 10 may be agreed upon.

Niedax Galvanik GmbH

The formation of conversion layers is a dynamic process beyond the chemical equilibrium. I Elementary zinc goes through acid attack in solution: So far, a good corrosion 550961 only on the basis of toxic chromium VI was reached.

The 500961 greenish chrome VI free chromate is accordingly depending on the production temperature between and nm thick, pale green in color and the natural red-green iridescent.

After rinsing and drying SS a corrosion protection of h until first attack according to DIN was found in the salt spray cabinet according to DIN. Evaluation shall be carried out at normal reading distance without a magnifier.

DIN – European Standards

The corrosion protection of the zinc based on the fact that it is still less noble than the base metal and therefore initially draws the corrosive attack exclusively to itself, it acts as a sacrificial layer. The procedure can be performed in conventional electroplating plants, has now applied for a patent.

A low pH favors the dissolution of zinc, but also provides for increased redissolution of the layer. The corrosion protection could be significantly increased simply by adding cobalt in the chromate again compared to Example 3. Dln prior art has four named according to fin colors chromating that a galvanized surface with the corresponding aqueous chromate coating can be applied in each case by treatment dipping, spraying, rolling. The rin protection of unmarred black zinc amounts to h in the salt spray cabinet according to DIN SS until the first occurrence of corrosion products.


Figure 1 shows the fold edge of a bright zinc plated and trivalent blue passivated steel sheet at 40,x magnification. For this purpose it must be known that chromium III exists in aqueous solutions substantially in the form of hexagonal complexes which generally have a high kinetic stability, and further that the ligand exchange is the rate limiting step in forward reaction II. Im folgenden wird jedoch stets auf die einer Gelbchromatierung vergleichbare Schicht Bezug ein.

Immersion time was 60 seconds. Accordingly, the chromate contained with said requests to the Cor rosionsschutz even these extremely toxic and carcinogenic chromium VI – compounds, which are also not completely immobilized in the layer. A concentrate according to claim 7, characterized in that the chromium III complex is selected from complexes with chromium III and at least one ligand selected from the group consisting of: This would probably be acceptable without further technical applications with a metallic appearance.

The corrosion protection of intact olive chromatings amounts to h in the salt spray cabinet according to DIN SS until the first occurrence of corrosion products.

Chromium III complexes generally have slow kinetics. If this were true, then one would with trivalent chromate coatings in terms of the achievable corrosion protection always at a disadvantage. A significant advantage over yellow chromates is the good heat resistance of Chromiting. Das betreffende verzinkte Bauteil bleibt unversehrt, solange es noch durchgehend mit Zink bedeckt ist. Table 1 gives an overview.


50691 Eintragung als Warenzeichen wurde beantragt. The corrosive attack on the zinc layer in turn can be greatly retarded by applying a chromate treatment, and thus also the base metal corrosion is even further delayed 5091 by mere zinc plating. For good corrosion protection, the passive layer should be thick and at the same time as compact as possible.

For this first attempt resulted in the deposition in situ generated black pigments after all quite dark layers so that this goal will be very likely to achieve.

Very thin chromate almost no intrinsic color are referred to as colorless Group A. The solution of this object is achieved with respect to a layer by the features of claims 1 and 21, process technology by the features of claims 4 and 17, and with respect to a composition useful for 5061 out the method according to the invention by the features of claims 7 and Mixtures for the coating of metal surfaces containing organic corrosion inhibitors. Chromate film-containing plug metal component and method for producing the same.


The Schwarzchromatierungsschicht is fundamentally a yellow or olive chromating, is inserted as a pigment in the colloidal silver. DE DEA1 en The chromate coating consists of water-dissolved hexavalent chromate, conducting salts and mineral acids substantially.

The base metal of the zinc-plated component remains intact, while there di still continuously covered with zinc, and the mechanical functionality is maintained over longer periods of time than in the case of parts. Black chromations zinc alloys fin significantly above the recited values.

Here the layer is scratched by friction under the weight of superimposed and each other by falling parts, especially when emptying so when the layer is still partially gel-like. Beuth Verlag GmbH Berlin. Die Ansatzpunkte a und b sind dem Fachmann bekannt.

Further advantageous ligand arising from the list according to claim 6 and 8. Therefore, it is object of the present invention to provide a chromium VI -free, thick chromate film with a high chromium content on zinc, cadmium or aluminum are available. Process for the surface treatment of metals and its use for the treatment of aluminium surfaces.

The question galvanized component remains intact as long as it is still continuously covered with zinc. Table 1 shows characteristics of zinc and zinc alloys, and alternative coatings.

Metal member with chromate coat, spark plug with chromate coat and manufacturing methods thereof. Bild 4 zeigt die Mittelwerte der dort chromitierten Teile sowie Praxiswerte von dreiwertigen Blau- und sechswertigen Gelbchromatierungen aus diversen Anlagen. 509961 normative references are cited at the appropriate places in the text, and the titles of the publications are listed below.