General
It is a repeated order, every two months for one batch.
Project Overview
This project involved the production of custom Dacromet coated fasteners for an industrial customer in Australia.
The fasteners were manufactured from alloy steel 4140 and produced through precision machining followed by Dacromet surface coating to improve corrosion resistance.
Dacromet Coating
Dacromet coating is a zinc-aluminum flake anti-corrosion system applied to steel parts to protect them from rust and environmental degradation.
The coating provides excellent corrosion protection while maintaining precise dimensions because the coating layer is very thin.
Application
Dacromet coated fasteners are widely used in:
- automotive components
- construction equipment
- outdoor machinery
- heavy industrial assemblies
The coating helps extend the service life of fasteners used in harsh environments.
Batch Code
Here X mean 2024, F mean July
Material and Hardness
Steel 4140, hardness 38-44HRC
Surface
Dacromet Coated, anti-corrosion, anti-wear.
Protection
The dacromet coating surface is easy to be damaged, so we use a plastic net to protect it for each fastener.
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What’s Dacromet coating?
Below is the explanation from AI:
Dacromet coating is a type of anti-corrosion coating commonly used on metal parts, particularly in the automotive, construction, and aerospace industries. It is a water-based coating that consists of a mixture of zinc and aluminum flakes, which are bound together by a chromium-based binder. The coating is applied through a dip-spin or spray process and then cured at high temperatures.
Key Features of Dacromet Coating:
- Corrosion Resistance: Dacromet provides excellent corrosion resistance, protecting metal surfaces from rust and environmental degradation. It is particularly effective in resisting salt spray and other harsh conditions.
- Thin and Even Coating: The coating is very thin (usually around 5 to 8 micrometers), which allows it to provide protection without significantly altering the dimensions or weight of the coated parts.
- Environmental Considerations: Dacromet is considered more environmentally friendly compared to traditional coatings because it is water-based and does not produce harmful volatile organic compounds (VOCs) during application. However, the presence of hexavalent chromium has raised environmental concerns, leading to the development of alternative coatings.
- Application Versatility: It can be applied to a wide range of metal substrates, including steel, aluminum, and iron, and is suitable for complex shapes and threaded parts.
- Heat Resistance: The coating is also known for its heat resistance, which makes it suitable for parts exposed to high temperatures.
Common Uses:
- Automotive Components: Fasteners, brake discs, and other parts that require high corrosion resistance.
- Construction: Structural components and fasteners.
- Aerospace: Parts that need to withstand harsh environmental conditions.
Due to environmental concerns related to chromium, newer coating technologies like Geomet (which is chromium-free) are being developed and used as alternatives to Dacromet.
