New coating system enhances corrosion resistance effectively

13 November, 2024

Rastelli Raccordi has a long-standing focus on environmental sustainability, reflected in its approach to product development and manufacturing. This includes mechanical processing, packaging, and surface treatments, the latter of which is particularly critical. The company’s efforts in this area have led to its certification under UNI EN ISO 14001:2015.

Hexavalent chromium and cobalt-free technology

Working in conjunction with its R&D department and galvanising facilities, Rastelli’s engineering team developed the Zi-Ni Total Screen System. This technology has been applied across the full range of Rastelli Raccordi products, including 24-degree DIN 2353 tube fittings, 37-degree SAE-J-514 adapters, hose fittings, and BSP, BSPT, and NPT adapters.

Corrosion protection

The Zi-Ni Total Screen System is based on a new electrolytic process that is free from hexavalent chromium and cobalt, ensuring compliance with EU2000/53/EC and RoHS 2007 European regulations. The system is produced in zinc treatment plants located at the company's facilities in Villanterio (PV), which are designed to minimise environmental impact while maintaining anti-corrosion properties.

Corrosion can lead to substantial maintenance and replacement costs, including potential production delays and equipment downtime. It spreads quickly and requires careful monitoring, particularly in environments exposed to chemicals, salt, fertilisers, and high humidity at elevated temperatures.

Consistent and stable results

The Zi-Ni Total Screen System demonstrates consistent performance, with a uniform nickel distribution rate of 12-15% across a wide range of current densities. This contributes to stability in corrosion resistance over time.

Red corrosion resistance

The system ensures thorough galvanic deposition, even in challenging areas such as the interior of bolted joints, resulting in increased coating thickness in regions with low current density.

Salt spray testing

Rastelli Raccordi subjects its products to salt spray tests to verify the effectiveness of the galvanising process. These tests use saline solutions and controlled temperatures to simulate exposure to corrosive agents that cause red rust. The results provide insight into how the protective coating performs over time when exposed to harsh conditions.

The tests, which include passivation and sealing stages, have demonstrated that the system provides greater resistance to red rust compared to other available solutions, with technical performance exceeding standard industry requirements.

For further information please visit: https://rastelliraccordi.com

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