AURUNA® 215: Decorative Gold Plating Electrolyte for Jewelry

In the jewelry electroplating industry, the quality of a gold plating electrolyte directly determines the color, uniformity, and stability of the deposited coating. AURUNA® 215 is a gold plating electrolyte specifically developed for decorative gold plating applications, featuring a nickel-free and cobalt-free formulation.

The product not only produces a bright gold coating with excellent color stability but also complies with the RoHS standard, making it suitable for manufacturers seeking safer and more sustainable production processes.

This article provides an overview of AURUNA® 215, highlighting its key advantages, practical applications, and the reasons why it has become an ideal solution for companies operating in the surface finishing and jewelry manufacturing industries.

I. What Is AURUNA® 215?

1. Overview

AURUNA® 215 is a gold alloy electroplating electrolyte designed for decorative gold plating applications. This mildly acidic electrolyte is formulated to produce coatings ranging from light gold to bright gold, making it suitable for products that require an attractive decorative finish.

A key distinguishing feature of AURUNA® 215 is that it contains no nickel or cobalt. These two metals are commonly associated with products that come into direct contact with the skin, as they may increase the risk of allergic reactions in certain individuals. By eliminating nickel and cobalt from the deposited coating, the electrolyte is particularly suitable for jewelry, watches, and other accessories intended for everyday wear.

2. Coating Properties

Property	Value
Deposit Type	Gold–Iron–Indium Alloy
Alloy Composition	98.5 wt.% Au; 1.4 wt.% Fe; 0.05 wt.% In
Coating Color	Approx. 1N–2N
Finish	Bright
Hardness	Approx. 220 HV (Vickers HV 0.015)
Maximum Coating Thickness	3 μm
Coating Density	Approx. 17.5 g/cm³

The electrolyte is designed to operate reliably within a relatively wide processing window. Within the recommended operating range, the coating color remains stable and is not affected by variations in pH or current density, enabling manufacturers to maintain consistent product quality across production batches.

In addition to rack plating, AURUNA® 215 is also suitable for barrel plating, providing greater flexibility for different production scales and a wide variety of components.

See also: AURUNA® 556 EF-24 – Pure Gold Electrolyte

See also: AURUNA® 555 Gold Plating Chemicals for Premium Jewelry Manufacturing

II. Why Is AURUNA® 215 Chosen by Many Manufacturers?

When selecting a gold plating electrolyte, manufacturers consider more than just the appearance of the coating. Process stability, the ability to meet technical requirements, and suitability for the intended application are equally important. These are also the factors that make AURUNA® 215 a preferred solution for decorative electroplating applications.

Figure 1. AURUNA® 215 Gold Plating Electrolyte

1. Nickel-Free and Cobalt-Free – Ideal for Products in Direct Contact with the Skin

One of the most significant advantages of AURUNA® 215 is that the deposited coating contains no nickel or cobalt.

Products such as rings, necklaces, bracelets, watches, and eyeglass frames are typically worn for extended periods. Using an electrolyte that is free of these two metals helps eliminate the risk of skin allergies associated with nickel and cobalt, making it particularly suitable for products designed with user safety in mind.

2. RoHS Compliant

In addition to aesthetics, many manufacturers today prioritize electroplating chemicals that comply with environmental and material regulations.

The coating produced by AURUNA® 215 complies with the RoHS standard, providing manufacturers with a suitable solution for applications requiring controlled material composition.

Using a RoHS-compliant electrolyte also supports greater consistency throughout the manufacturing process, especially for companies serving markets with stringent technical requirements.

3. Attractive Gold Color with Excellent Color Stability

A high-quality decorative coating is defined not only by its initial appearance but also by its ability to maintain consistent color throughout production.

AURUNA® 215 produces coatings ranging from light gold to bright gold (approximately 1N–2N), making it suitable for a wide range of decorative gold plating applications.

Within the recommended operating conditions, the coating color remains stable and is independent of variations in pH and current density. This minimizes color differences between production batches and helps manufacturers maintain consistent product quality.

4. Indium Ensures Uniform Color Distribution

In addition to gold and iron, AURUNA® 215 contains indium.

This element contributes to a uniform and consistent coating color across the entire surface of the plated component.

For parts with complex geometries or products requiring a premium decorative finish, maintaining consistent color is a significant advantage. Uniform coatings also help reduce the need for rework, improving production efficiency and quality control.

5. Easy Operation Across Various Production Processes

For electroplating companies, an electrolyte should not only produce an attractive coating but also support a stable and easy-to-control production process. This is one of the key strengths of AURUNA® 215.

This mildly acidic gold alloy electrolyte is designed to operate within a relatively wide processing window. As a result, manufacturers can maintain coating quality without continuously adjusting process parameters, provided they remain within the recommended operating range.

6. Suitable for Both Rack Plating and Barrel Plating

Not every gold plating electrolyte is compatible with multiple plating methods. AURUNA® 215, however, is designed for both rack plating and barrel plating.

Rack plating is suitable for larger components or parts that require individual positioning during plating, while barrel plating is ideal for processing large quantities of smaller components efficiently.

Compatibility with both methods provides manufacturers with greater flexibility in selecting production processes while using the same electrolyte system.

III. Applications of AURUNA® 215

In addition to its outstanding composition and stable operating performance, AURUNA® 215 is widely used in decorative gold plating applications that require attractive, consistent coatings with reliable quality. Its nickel-free and cobalt-free formulation also makes it an excellent choice for products that frequently come into direct contact with users.

Figure 2. Applications of AURUNA® 215

1. Gold Plating for Jewelry

Jewelry is one of the primary applications of AURUNA® 215. Thanks to its unique characteristics, the electrolyte meets both the aesthetic and safety requirements of the jewelry industry.

Products such as rings, necklaces, bracelets, and earrings require gold coatings with an attractive appearance, excellent color uniformity, and consistent quality across production batches. Since these products are worn directly against the skin for extended periods, using a nickel-free and cobalt-free electrolyte helps eliminate the risk of skin allergies associated with these metals.

2. Gold Plating for Watches

Watches are not only timekeeping devices but also valuable fashion accessories. Decorative components such as watch cases, clasps, and ornamental metal parts require uniform coating color to achieve a premium appearance.

The bright gold finish and excellent color stability provided by AURUNA® 215 enable manufacturers to maintain better quality control throughout the production of gold-plated watches.

3. Gold Plating for Eyeglass Frames

Eyeglass frames remain in direct contact with the wearer’s skin and therefore require high-quality decorative coatings.

Using AURUNA® 215 produces a uniform gold coating while meeting the requirement of being free from nickel and cobalt. This makes it particularly suitable for premium and fashion eyeglass frames.

4. Fashion Accessories

Beyond jewelry and watches, AURUNA® 215 is also used for gold plating various fashion accessories, including buckles, decorative fasteners, and other metal components.

These products require coatings with an attractive appearance, uniform color, and consistent quality across production batches. The stable operating performance of the electrolyte helps manufacturers maintain product quality throughout the manufacturing process.

IV. Which Manufacturers Is AURUNA® 215 Suitable For?

Thanks to its versatility, AURUNA® 215 is suitable for a wide range of manufacturing industries, including:

Jewelry electroplating companies
Jewelry manufacturing and processing workshops
Watch manufacturers
Eyewear manufacturers
Fashion accessory manufacturers
Companies specializing in surface finishing and electroplating chemicals

Rather than serving only a single application, AURUNA® 215 offers flexibility for various production models, from specialized workshops to large-scale manufacturing facilities.

V. Important Considerations When Using AURUNA® 215

A high-quality electrolyte can only deliver its full performance when operated under the recommended technical conditions. Therefore, in addition to selecting the right product, manufacturers should also pay close attention to controlling the operating conditions of the plating bath.

1. Operate Within the Recommended Parameters

Operating parameters such as pH, temperature, and current density should be maintained within the manufacturer’s recommended range. This helps ensure stable plating performance and produces coatings with consistent quality.

Operating outside the recommended parameters may affect plating results and the stability of the electrolyte.

2. Monitor pH Regularly

AURUNA® 215 is a mildly acidic electrolyte with a recommended pH of approximately 4.0, within an operating range of 3.8–4.5.

Manufacturers should monitor the pH regularly to ensure that the electrolyte continues to operate under appropriate conditions.

3. Maintain the Recommended Operating Temperature

Temperature is another important operating parameter that should be carefully controlled.

According to the product’s technical documentation, the recommended operating temperature is approximately 35°C, with an acceptable range of 30–35°C. Maintaining a stable operating temperature helps ensure that the plating process performs as intended.

4. Replenish Chemicals According to Technical Guidelines

During production, the metal content of the electrolyte gradually changes as plating proceeds.

Therefore, manufacturers should replenish the electrolyte according to the recommended technical guidelines to maintain the electrolyte composition within the specified operating range.

5. Monitor Plating Bath Quality Regularly

Regular monitoring of plating bath parameters allows manufacturers to identify operational changes before they affect production.

Routine bath control also helps maintain process stability and ensures consistent coating quality across different production batches.

See also: AURUNA® 215 – Premium Gold Plating Solution with Superior Color Stability

VI. Why Choose Genuine AURUNA® 215 from PMAC?

In addition to selecting the right gold plating electrolyte, partnering with a reliable supplier plays a crucial role in ensuring efficient operation and optimizing production processes.

As the official distributor of Umicore in Vietnam, PMAC supplies genuine AURUNA® 215 together with professional technical consulting services for companies operating in the electroplating and surface finishing industries.

When purchasing AURUNA® 215 from PMAC, customers benefit from:

Genuine Umicore products
Expert consultation on selecting the most suitable plating electrolyte for specific applications
Technical support throughout the product’s service life
Continuous assistance in optimizing electroplating processes

PMAC not only supplies electroplating chemicals but also helps manufacturers identify the most appropriate solutions for their production requirements, contributing to improved operational efficiency and product quality.

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Figure 3. PMAC – Official Distributor of Genuine AURUNA® 215

Conclusion

In the field of decorative gold plating, selecting the right gold plating electrolyte influences not only the appearance of the deposited coating but also the stability of the production process and the overall quality of the finished product.

With its nickel-free and cobalt-free formulation, AURUNA® 215 is an ideal solution for a wide range of applications, including jewelry electroplating, gold plating for watches, gold plating for eyeglass frames, premium writing instruments, and fashion accessories. In addition to producing coatings with a light gold to bright gold color (approximately 1N–2N), the electrolyte provides excellent color stability over a wide operating range, complies with RoHS requirements, and is suitable for both rack plating and barrel plating.

For manufacturers seeking a gold plating electrolyte that delivers stable quality while meeting the requirements of products intended for prolonged skin contact, AURUNA® 215 is a solution worth considering.

As the official distributor of Umicore in Vietnam, PMAC supplies genuine AURUNA® 215, complete technical documentation, and professional technical consultation to help customers select the most appropriate electroplating solutions for their production needs.

Whether you need more information about AURUNA® 215, assistance in selecting the appropriate plating process, or a product quotation, PMAC’s technical team is always ready to support you.

CONTACT PMAC TODAY FOR PROFESSIONAL CONSULTATION AND A FREE QUOTATION FOR AURUNA® 215!