A More Energy-Efficient and Environmentally Friendly Chromium-Free Dacromet Coating

2024-12-27　·　Wuhan Kaiming High Tech Co., Ltd.

Published:

2024-12-27

Dacromet is the name commonly used for a zinc-chromium coating. The source describes a corrosion-resistant coating containing zinc powder, aluminium powder, chromic acid and deionised water.

Dacromet is described as a zinc-chromium anti-corrosion coating containing zinc, aluminium, chromic acid and deionised water. The source identifies three protective mechanisms: overlapping metal flakes form a barrier to water and oxygen; reactions form a dense passivation film; and the zinc-aluminium-chromium layer provides cathodic protection. It lists corrosion resistance, absence of hydrogen embrittlement, heat resistance, penetration, adhesion and recoating advantages over conventional electroplating. It qualifies its earlier environmental claims: lack of production waste does not make the coating entirely harmless, because chromium can be toxic and carcinogenic and harm crops and microorganisms. Chromium-free formulations are presented as a way to reduce these risks.

The source proposes a chromium-free Dacromet coating to reduce chromium hazards while retaining coating performance. It lists zinc powder 20-30%, aluminium powder 5-10%, solvent 20-30%, additive 5-10% and film former 10-10%, exactly as stated. Its detailed formulation lists zinc 20-30%, aluminium 5-10%, diethylene glycol butyl ether 20-30%, n-butanol 5-10%, inorganic resin 10-20% and tin 5-10%. Diethylene glycol butyl ether is the solvent, n-butanol the additive and inorganic resin the film former. Zinc and aluminium are flakes of 5-25μm diameter; the resin is industrial grade.Pending confirmation

The source describes a chromium-free Dacromet coating that replaces conventional chromic acid with tin and film-forming materials to avoid chromium hazards. Tin resists rust and environmental attack and offers flexibility useful in processing. It describes inorganic resin as environmentally preferable, lower-cost and suitable for broader adoption.

What innovative metal surface repair applications are used in Industry 4.0?Pending confirmation

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What innovative metal surface repair applications are used in Industry 4.0?Pending confirmation

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