ISO 4042:2022/Amd 1:2026

Overview

ISO 4042:2022/PRF Amd 1 is a draft amendment to the international standard ISO 4042:2022, which outlines requirements for electroplated coating systems on fasteners. Published by ISO and prepared by Technical Committee ISO/TC 2, Subcommittee SC 14, this amendment focuses on enhancing clarity and adaptability regarding passivation methods for zinc-nickel (ZnNi) coatings. The incorporation of this amendment supports modern advancements in corrosion protection and manufacturing efficiency while ensuring continued compliance with global standards.

Electroplated coatings are vital in extending the performance and durability of fasteners used across a range of industries. By updating the standard's provisions, ISO seeks to align practices with current technological developments and user needs in the field of surface engineering.

Key Topics

• Electroplated Coating Systems: Guidance on the application, testing, and specification of protective electroplated coatings for fasteners, specifically zinc-based finishes.
• Amendment to Neutral Salt Spray Test (NSS): Updates in the prescribed methods and interpretation of corrosion resistance for zinc-based coating systems.
• Passivation Methods: Introduction and clarification of transparent passivation options for ZnNi coatings, providing equivalent corrosion resistance while enabling thinner coatings.
• Table 8 Modifications: Addition of a new footnote regarding transparent passivation (An) for ZnNi, stating its effectiveness despite lower material thickness compared to conventional iridescent passivation.

Applications

ISO 4042:2022/PRF Amd 1 is directly relevant for manufacturers, suppliers, and quality assurance professionals engaged with:

• Automotive and Aerospace Manufacturing: Ensuring long-lasting, corrosion-resistant fasteners for vehicle and aircraft assembly.
• Construction and Infrastructure: Providing durable fixings for buildings, bridges, and other structures exposed to corrosive environments.
• General Engineering: Supporting production consistency for machines, appliances, and industrial equipment.
• Quality Control Testing: Using the clarified protocols for neutral salt spray testing to reliably evaluate corrosion protection of coated fasteners.
• Surface Treatment Providers: Adopting advanced transparent passivation systems to meet performance and material efficiency targets.

By recognizing transparent passivation (An) as a valid alternative to traditional thick-layer passivation, this amendment enables users to achieve desired corrosion protection with less material use, potentially reducing costs and supporting sustainability initiatives.

Related Standards

To ensure full compliance and optimize performance, users of ISO 4042:2022/PRF Amd 1 should be aware of the following related standards:

• ISO 4042:2022 - The parent standard, detailing the general requirements for electroplated coating systems on fasteners.
• ISO/IEC Directives, Part 1 and 2 - Guidelines relevant to the development and maintenance of ISO standards.
• Other ISO Fastener Standards - Covering material properties, dimensions, and performance for a wide range of fastener products.
• CEN/TC 185 Standards - European standards from CEN Technical Committee 185, often harmonized under Vienna Agreement initiatives for global alignment.
• ISO 9227 - Standards for corrosion tests in artificial atmospheres, including methods such as neutral salt spray.

Practical Value

The amendment offers enhanced flexibility in selecting coating options for fasteners while maintaining strict corrosion resistance criteria. Organizations adopting ISO 4042:2022/PRF Amd 1 benefit from:

• Improved Product Performance: Updated passivation options provide reliable protection with optimized material usage.
• Regulatory Compliance: Eases adherence to both international and regional demands for fastener surface treatments.
• Sustainability: Enables resource-efficient coating processes, supporting environmental and cost objectives.

Implementing this amendment will help stakeholders maintain quality, reduce resource consumption, and stay current with international fastener coating standards.