News Letter has been released(2025.Mar)!! Corrosion-resistant, Allergy-free, and Wear-resistant! Evolved Plating Technology

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[Electrolytic corrosion resistant connectors]
We are pleased to introduce Yokowo’s latest products, “Electrolytic corrosion resistant connectors”

[Product Overview]
The new " Electrolytic corrosion resistant connectors" boasts improved corrosion resistance, allergen resistance, and wear resistance compared to conventional standard products, making it usable in a variety of scenarios.

[Development Background]
Development began in response to customer requests for usage in particularly harsh environments.

[Development Points]
- We reviewed the plating process to improve corrosion resistance, allergen resistance, and wear resistance.

[Recommended Points]
- Improved corrosion resistance (electrolytic, chemical, saltwater, etc.).
- Allergen resistance (Ni-free).
- Improved wear resistance.
- Can be expanded to other Yokowo connector variations.

[Usage Examples]
It can be used in various products, such as mobile devices and wearable devices.

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[Reference Information]

■What kind of corrosion do the connectors face?
It's mainly classified as localized corrosion, where the main cause is "dezincification corrosion" due to pinholes. The causes leading to corrosion are varied, including fingerprints, chemical deposits, short circuits due to rain or condensation, and wear. Today, we introduce the mechanisms to corrosion.

■What is dezincification corrosion?
Dezincification corrosion is a phenomenon where zinc in brass (an alloy of copper and zinc) dissolves, leaving behind a red, sponge-like copper residue. This occurs particularly in brass with a zinc content of 30%–40%, preferentially in the β phase. This phenomenon is more likely to occur when exposed to chlorinated water or hot degreasing solutions for extended periods, and it’s also influenced by the pH and chloride ion concentration. As a countermeasure, brass compositions that don’t easily form in the β phase or dezincification-resistant brass (DZR) with small additions of arsenic or tin are effective.

■What is electrolytic corrosion?
Electrolytic corrosion, also known as galvanic corrosion, occurs when different metals come into contact in an electrolyte, causing one of the metals to corrode due to the potential difference. This type of corrosion is driven by the potential difference between dissimilar metals. Countermeasures include avoiding contact between dissimilar metals, using insulating materials, applying protective coatings, and designing to minimize potential differences. Combining these measures can significantly reduce the risk of electrolytic corrosion.

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[Comparison with Existing Products]

- In electrolytic corrosion, conventional products (Sample ① & ②) discolored within 5 minutes, but the silver color special plating (Sample ③) did not discolor even after 10 minutes and showed no corrosion.
- The silver color special plating has a slower dissolution rate, a lower ionization tendency, and is more resistant to electrolytic corrosion compared to conventional products.

	Conventional product		Special plating product
	Sample①	Sample②	Sample③
Before test
After test

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Previous Newsletter

■Yokowo introduction movie■	■Yokowo Fine Connector Div. introduction movie■
*The above link will direct you to a YouTube site.	*The above link will direct you to a YouTube site.

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2025/03

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