DIN 50979 PDF

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DIN This standard applies to electroplated and Cr(VI)-free passivated zinc and zinc alloy coatings on ferrous materi- als. The zinc alloy coatings contain. Home; DIN Preview. DIN [ Withdrawn ]. Metallic Printed Edition + PDF; Immediate download; $; Add to Cart. Standards [Withdrawn]. DIN Metallic coatings - Electroplated coatings of zinc and zinc alloys on iron or steel with supplementary Cr(VI)-free treatment.


Din 50979 Pdf

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basics of DIN and DIN EN At the same time, they comply with DIN , thus protecting natural resources and the environment. kaz-news.infolon. DIN , is mainly suitable for cor- rosion protection of small parts. The zinc which is present on the sur- face may also be exposed to corro- sion depending. download DIN METALLIC COATINGS - ELECTROPLATED COATINGS OF ZINC AND ZINC ALLOYS ON IRON OR STEEL WITH.

This standard defines the designations for the coating systems indicated above and specifies minimum corrosion activities in the described test methods as well as the minimum layer thickness necessary for this.

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Normative references The documents cited below are necessary for the application of this document. In the case of dated references, only the edition referred to applies. In the case of undated references, the last edition of the document including all amendments referred to applies.

Designation: 3. Electroplated coatings The electroplated coatings consists of zinc or zinc alloys corresponding to Table 1.

Passivating Passivating designates the production of conversion layers by treatment with suitable Cr VI -free solutions in order to improve the corrosion resistance of the coatings. Colourations are possible. As chromium VI -free passivations are new systems, a new nomenclature according to Table 2 has been adopted.

Sealing Seals increase the corrosion resistance and usually have a layer thickness up to 2?

Products that can be removed with cold cleaner e. The effect of seals on the functional properties of the component, e.

Essential areas functional area In the case of components with complex shapes, in particular components with hollow spaces, it is possible that the requirements for the resistance in the short-term corrosion tests and for the minimum thickness cannot be complied with in all areas of the electroplated surface.

In these cases, the areas essential for the surface protection must be marked with a dot-dash line on the drawing. Order data The customer must provide at least the following information to the coating company: a Component strengths with consideration of 6. If required, more detailed requirements for the coating properties and testing e. If necessary, additional information on requirements or restrictions for the coating process can be given.

Base materials The coating of components from low-alloy steels with coatings according to this standard is state-of-the-art. If other iron-based materials are present e. The coating company therefore needs to have detailed information on the composition, properties and production process of the components to be coated.

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The impurities corrosion products or scale, oil, grease, dirt etc. An agreement concerning the surface quality might be necessary, if applicable.

Pretreatment and deposition of the zinc or zinc alloy coating In order to ensure a reliable process sequence, the complete pretreatment and coating process, physical data treatment times, temperatures as well as all process chemicals must be recorded, documented and optimised if need be. The individual process intervention limits as well as the frequency of the monitoring and analysis processes must be defined. The resultant measures must be described and archived by the coating company. Post-treatments 6.

Passivations Passivations are conversion coatings and are created by immersing or spraying the components with passivation solutions. At the same time, the deposited coating reacts with the passivation solution to form a thin film protecting the metallic coating.

Part of the coating is usually dissolved by the reaction.

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Layer accumulations can result, depending on the component geometry and process. These must be minimised, if possible, through suitable measures e.

The components are introduced into the coating drums as bulk material then pretreated and provided with the coating while the drum is rotating.

The drum rotation ensures that all components are coated comparably. However, surface damage can result due to the movement of the parts. It is possible to minimise the damage e. Nevertheless, drum coatings usually yield a lower corrosion resistance than is the case with trestle coatings. Trestle parts This involves parts which have to be coated on the trestle owing to their size, design or, possibly, special requirements.

As chromium VI -free passivations are new systems, a new nomenclature according to Table 2 has been adopted. Black passivated Fn Black b u S - 8 2 a 4 Colour shades can occur. Essential areas functional area In the case of components with complex shapes, in particular components with hollow spaces, it is possible that the requirements for the resistance in the short-term corrosion tests and for the minimum thickness cannot be complied with in all areas of the electroplated surface.

In these cases, the areas essential for the surface protection must be marked with a dot-dash line on the drawing. Base materials The coating of components from low-alloy steels with coatings according to this standard is state-of-the-art. If other iron-based materials are present e.

The coating company therefore needs to have detailed information on the composition, properties and production process of the components to be coated. The impurities corrosion products or scale, oil, grease, dirt etc.

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An agreement concerning the surface quality might be necessary, if applicable. Pretreatment and deposition of the zinc or zinc alloy coating In order to ensure a reliable process sequence, the complete pretreatment and coating process, 5 physical data treatment times, temperatures as well as all process chemicals must be recorded, 5 : documented and optimised if need be.

The individual process intervention limits as well as the frequency 4 3 : 0 of the monitoring and analysis processes must be defined.

The resultant measures must be described 1 4 2 6- and archived by the coating company. Post-treatments 7 8 9 4. At the same time, the deposited coating reacts with the passivation solution to G e form a thin film protecting the metallic coating.

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Part of the coating is usually dissolved by the reaction. Layer accumulations can result, depending on the component geometry and process. These must be minimised, if possible, through suitable measures e. Drum parts Typical drum parts are bolts, nuts and other small components.

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The components are introduced into the coating drums as bulk material then pretreated and provided with the coating while the drum is rotating. The drum rotation ensures that all components are coated comparably. However, surface damage can result due to the movement of the parts. It is possible to minimise the damage e.

Nevertheless, drum coatings usually yield a lower corrosion resistance than is the case with trestle coatings. Trestle parts This involves parts which have to be coated on the trestle owing to their size, design or, possibly, special requirements.

During this, the parts are coated while positioned on trestles. Depending on the position of the components on the trestle, different layer properties mainly layer thickness of the metallic coating can result Optimisation is possible, for example, by using component-specific trestles.

Hydrogen embrittlement 5 5 : 6. Basics 4 3 : 0 1 4 The steel parts to be coated can absorb hydrogen during the electroplating treatment for creating 2 - 6 0- coatings according to this standard, e. Active hydrogen diffused in the metal lattice preferably at energetically 2 - 1 favourable areas lattice structural faults, areas of high stress concentration. The hazard due to hydrogen increases as the strength increases. Method selection 0 0 2 2 - 6.

The procedure for dealing with potential defective 7 8 9 coatings peeling-off of coatings and new coatings must be examined and consequences resulting from 4. These must be carried out after the electroplating for the hydrogen effusion and, if necessary, also before the electroplating to relieve component internal stresses. For this, see also E DIN , 3. It is particularly important to ensure that the applied metallic coating as a diffusion barrier does not prevent the success of the heat treatment for the hydrogen effusion.Welding Consultants, Inc.

However, surface damage can result due to the movement of the parts. Designation: 3.

REMARK The corrosion performance of the coated components in use cannot be concluded from the results of the short-term corrosion tests without more information. It is particularly important to ensure that the applied metallic coating as a diffusion barrier does not prevent the success of the heat treatment for the hydrogen effusion. Robert S. The coating company therefore needs to have detailed information on the composition, properties and production process of the components to be coated.

The procedure for dealing with potential defective coatings peeling-off of coatings and new coatings must be examined and consequences resulting from this described. The individual process intervention limits as well as the frequency of the monitoring and analysis processes must be defined. Pretreatment and deposition of the zinc or zinc alloy coating In order to ensure a reliable process sequence, the complete pretreatment and coating process, physical data treatment times, temperatures as well as all process chemicals must be recorded, documented and optimised if need be.