Threaded articles shall be coated as agreed. Your command of English seems excellent, so I'd suggest just getting an English copy. We need to perform a finish according to DIN [link by ed. It is recommended that the standard designation of the base material follow the symbol of the base metal. The world's most popular metal finishing site, and striving to be the internet's friendliest corner topic DIN Black Oxide Finish A discussion started in but continuing through Q. 
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To meet special requirements, paints or similar coatings may be applied. If the components are to be aftertreated in water-displacing anti-corrosion agents, they shall be treated while cold to minimize the loss of solvent by evaporation.
DIN Artificial climates in technical applications — Condensation water test atmospheres DIN Protective coatings on metals — Concepts, application methods and surface preparation DIN Electroplated and chemically applied coatings — Designation and information in technical documentation DIN EN Corrosion protection of metals — Electrodeposited coatings — Method of specifying general requirements Continued on pages 2 to dinn.
If the components are to be aftertreated in water-displacing anti-corrosionagents, they shall be treated while cold to minimize the loss of solvent by evaporation. Hi, One of our components requires 72 hrs. In some cases, the quality of the coating may be improved by adding other salts to the bath.
The purpose of this treatment is to give the material a particular appearanceand to increase its corrosion resistance even without aftertreatment.
No other bath checks are generally needed.
DIN 50938 Black Oxide Finish
We need to perform a finish according to DIN [link by ed. The specimen or component shall then be immersed in the test solution at ambient temperature until the coatinghas been dissolved. fin
Thesenormative references dinn cited at the appropriate places in the text, and the titles of the publications arelisted below. The purpose of this treatment is to give the material a particular appearance and to increase its corrosion resistance even without aftertreatment.
Assessment of oxalic acid test Appearance of exposed coating area Black to brownish black with exposed halo1 1 Quality of coating Grey with light-grey halo Inadequate Good Even good quality coatings may have very bright halos due to metal being exposed at the boundary of the area to which the solution was applied.
Questions about DIN Black Oxide Finish
About three drops of the test solution shall idn be applied to a flat areaof the coated specimen or component. DINArtificial climates in technical applications — Condensation water test atmospheresDINProtective coatings on metals — Concepts, application methods and surface preparationDINElectroplated and chemically applied coatings — Designation and information in technicaldocumentationDINENCorrosion protection of metals — Electrodeposited coatings — Method of specifying generalrequirementsContinued on pages 2 to 5.
DIN dni which reducing agents or other reagents may have been added. Designation of supplementary treatments applied to black oxide coatingsSymbolType of treatmentT1Application of paints, varnishes, pow-der coatings or similar materialsT4Application of grease, oil or other lubri-cantsT5Application of waxT10Application of water-displacing anti-corrosive agentsNOTE: This process provides iron and steel i.
When components having highly contoured surfaces are tested, the minimum exposure time shall be agreed on a case-by-case basis. Please share the ideas. The customer may provide the following supplementary information: Regards, Ted Mooney, P.
The good news is that the spec is available in both German and English versions. Slight changes in hue shall be ignored. Can you tell us if it specifies a humidity or neutral salt spray exposure requirement in addition to the weight requirement? In some cases, the quality of the coating may beimproved by adding other salts to the bath.
DIN - European Standards
It is recommended that the standard designation of the base material follow the symbol of the base metal. These shall be designated as follows: Almost on top of the page it says in English: The world's most popular metal finishing site, and striving to be the internet's friendliest corner topic DIN Black Oxide Finish A discussion started in but continuing through Q.
These normative references are cited at the appropriate places in the text, and the titles of the publications are listed below. Previous editions DIN When components having highly contoured surfaces are to be tested, full immersion with amended times idn agreed.
It sounds to me like, in addition to processing to DINthe parts must also pass a 70 hour humidity test per ISO
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