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Din 50961 Fe Zn 8b ^new^
DIN 50961, titled "Electroplated coatings - Zinc coatings on iron or steel - Terms, testing and corrosion resistance," is the foundational document for this specification. It is crucial to understand that this standard is not meant to stand alone. It is designed to be the international standard DIN EN ISO 2081 , which outlines the general requirements for electroplated zinc coatings with supplementary treatments.
: Modern applications of "8b" usually utilize Trivalent Chromium ( Cr3+cap C r raised to the 3 plus power
This article is for informational purposes. Always consult with your plating supplier and test samples under actual service conditions.
The surface treatment alphanumeric code can be systematically broken down into four distinct parameters:
Due to its balance of good corrosion protection, attractive appearance, and cost-effectiveness, FE Zn 8B is specified for a vast range of industrial components. It is commonly found in:
The technical code specifies an electroplated zinc coating applied to an iron or steel substrate with a minimum thickness of 8 micrometers (
Minimum 48 to 72 hours before the base steel begins to corrode. Hydrogen Embrittlement Risk
the above mentioned directives. See figure 1 for an overview of our alternatives. Application data on zinc (Zn) and zinc coatings. www.mff.dk
Historically, "B" denoted a finish containing hexavalent chromium ( Cr6+cap C r raised to the 6 plus power
The historic DIN 50961 standard allowed the use of hexavalent chromium ( CrVIcap C r raised to the cap V cap I power
: Indicates the type of supplementary chromate conversion coating, or passivation. The letter "b" specifically dictates a bright, clear, or bluish chromate layer . Technical Breakdown of the 8-Micron Zinc Layer ( Zn8cap Z n 8
Therefore, "8b" signifies an 8 μ m thick zinc coating with a finish. Corrosion Resistance and Passivation (DIN 50961 "b")
Modern manufacturing must comply with strict environmental and safety regulations, such as RoHS (Restriction of Hazardous Substances) and REACH. Because hexavalent chromium is a known carcinogen, modern platers fulfill the "B" specification using trivalent chromium ( Cr3+cap C r raised to the 3 plus power