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1、 GERMAN STANDARD July 2008 A b) Data on the component: Basic material, component manufacturing process, heat treatments; c) Data on the essential areas in conjunction with 3.4; d) Designation of the coating to be applied (see 3.5). If required, more detailed requirements for the coating properties a
2、nd testing (e.g. appearance, sliding properties, media resistance) can be specified. If necessary, additional information on requirements or restrictions for the coating process can be given. DIN 50979:2008-07 6 A b) Pickling (usually HCl, inhibited); c) Alkaline electrolytic degreasing (preferably
3、anodic); d) Metal deposition; e) Post-treatment through passivation and, if necessary, sealing; f) Drying. 6.2. Post-treatments 6.2.1. Passivations Passivations are conversion coatings and are created by immersing or spraying the components with passivation solutions. At the same time, the deposited
4、 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. DIN 50979:2008-07 7 A hydrogen absorption during the pretreatment and coating process; mechanical parts stress, also locally depending on the d
5、esign of the parts. have to be taken into account in particular. DIN 50979:2008-07 8 A Coulometric method as per DIN EN ISO 2177; Magnetic method as per DIN EN ISO 2178 The layer thickness of passivations and seals is not included in the consideration. 7.2. Layer adhesion The test parts are stored f
6、or 30 minutes at (220 10) C and then immediately quenched in water with a temperature of 15 C to 25 C. Flaking and blister formation must not occur in the coating (thermal shock test as per DIN EN ISO 2819). REMARK A bending or surface grinding of the components, if feasible, is recommended as a fur
7、ther test for the adhesive strength. DIN 50979:2008-07 10 A b) Conformity of the coatings with the requirements of this standard; c) Coating company for the surface protection; d) Applied technology (e.g. trestle or drum coating and applied coating system). 8.2. Special data for coating high-strengt
8、h materials with tensile strength 1 000 N/mm Designation and confirmation of the measures implemented for minimising the risk of delayed hydrogen-induced brittle fractures. 8.3. Test results Results of the technological tests according to this standard (see section 7). The tests as per 7.2, 7.3, 7.4
9、 must be carried out accompanying the process. The test bodies (supplier and/or subcontractor and/or independent test institute) are to be appointed. DIN 50979:2008-07 13 A&I Standards Subscription - KNORR-BREMSE Systeme fr Schienenfahrzeuge GmbH - Cust. no. 4987428 - Subs. no. 00849501/002/001 - 20
10、08-06-24 10:34:55 References DIN EN ISO 1463, Metallic and oxide coatings Measurement of coating thickness Microscopical method DIN EN ISO 2177, Metallic coatings Measurement of coating thickness Coulometric method by anodic dissolution DIN EN ISO 2178, Non-magnetic coatings on magnetic substrates Measurement of coating thickness Magnetic method DIN EN ISO 2819, Metallic coatings on metallic substrates Electrodeposited and chemically deposited coatings Review of methods available for testing adhesion
