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ENIG – electroless nickel immersion gold in PCB surface finishes

ENIG - electroless nickel immersion gold in PCB surface finishes

ENIG is a surface modification method that can be used on a variety of materials. In this process, the metal is immersed in an extremely pure solution of nickel chloride and water, which causes the metal’s surface to become covered with a layer of nickel oxide. This process can be used to create decorative items such as jewelry, pins, and earrings, but it can also be applied to other items such as lock cylinders and keys.

What is PCB surface finish and its types?

PCB surface finish is the finish applied to a printed circuit board. It is used to prevent corrosion and increase the life of the PCB.More information about PCB surface, please browse the article:Five common PCB surface treatment processes. Today, we will give a brief list of common types of surface finishes:
What-is-PCB-surface-finish-and-its-typesSilver-coated copper (SC) – This is a common method of finishing copper CPUs, because it prevents corrosion and increases the life of the chip.
Gold-plated copper (GP) – This type of coating on copper has a lower coefficient of thermal expansion, which reduces heat transfer through the PCB.
Aluminum-filled polyester resin (APR) – Aluminum is used in this process because it provides good heat conductivity and mechanical strength without adding weight to the board.
Hot Air Solder Level (HASL)-It is to coat molten tin lead solder on the surface of PCB and level (blow level) it with heated compressed air.
Organic Solderability Preservative (OSP)-It grows an organic film on the clean bare copper surface by chemical method, which acts as a barrier between copper and air.
ENIG – Wrap a thick layer of nickel alloy with good electrical properties on the copper surface, which can protect the PCB for a long time.

● Others include immersed tin, immersed silver, chemical nickel palladium gold and electroplated hard gold.

what does ENIG stand for?

ENIG is a process used to create an alloy of nickel, gold, and other metals. It is also known as electroplating, electroless plating or electrowinning.

The process can be done at room temperature or with high temperatures. The most common form of ENIG is used in jewelry making because it produces a beautiful finish on silver, gold, and platinum alloys without damaging them or causing any damage to your workbench!

What’s the advantages and disadvantages of ENIG?

The advantages of using ENIG include:

● ENIG is much cheaper than other processes like plating and electroplating. In addition, it can also be used in small quantities, which makes it ideal for small companies with limited budgets.

● ENIG works well with all kinds of metals, including stainless steel, copper, brass and aluminum. This makes it easy to use on almost any type of object you want to decorate.

There are several disadvantages to ENIG. One of them is cost: it’s not as cheap as other methods. Another disadvantage is that ENIG does not work well with some types of materials, like stainless steel and bronze, which can cause problems for those materials when they come into contact with ENIG chemicals.
What's the advantages and disadvantages of ENIG

How is ENIG applied?

ENIG is an electroplating process that uses a nickel-containing solution to deposit metal onto a substrate. It can be used to deposit gold, platinum, palladium, and other metals onto substrates such as glass, silicon dioxide (SiO2), aluminum oxide (Al2O3), steel and stainless steel. The process is well-suited for applications where high-purity metal deposition is desired.

The basic steps in the ENIG process are:
1. Anodization of the substrate by electrolysis of an alkaline solution.
2. Immersion in the electrolyte solution at elevated temperature for several minutes.
3. Removal from the electrolyte solution by rinsing with distilled water.
4. Drying of the substrate with heat or air flow.

what is ENIG process?

ENIG is the process of using nickel-based electroplating to create gold-plated stainless steel. The process requires a catalyst system, which acts as a mediator between the metal and the nickel-based solution. It is used to produce high-quality, corrosion-resistant, and cost-effective products with a uniform color and thickness.

What metals can be plated by ENIG?

In the past, ENIG was most commonly used on precious metals. However, today we are seeing a growing demand for ENIG plating on non-precious metals such as copper and zinc.

The use of ENIG on non-precious metals is not new—it has been used for decades on copper, aluminium, and brass. But until recently it was not widely available for other metals. The reason is that these materials are very reactive to the process and have high surface areas.

ENIG is able to plate in a very short time frame while avoiding any damage to the material’s surface. ENIG is also able to provide excellent adhesion between the plated layer and the substrate, which makes it an excellent choice for applications where adhesion is important.

is ENIG the same as immersion gold?

Is ENIG the same as immersion goldImmersion gold is a technique used to extract gold from ore, effectively changing it into a liquid form. The process is similar to electrolysis, but with electrodes submerged in the ore and a strong electrical current running through them. The electrodes are then separated and heated, causing the gold to be deposited on them as they cool.

Electroless nickel is different in that it involves heating up nickel with carbon and platinum electrodes in an acid bath to create an alloy with a high concentration of nickel and silver. The process has been used for over 100 years now, but only recently has it become commercially viable thanks to advances like this new technology called ENIG (Electroless Nickel Immersion Gold), which allows you to use 100% nickel as your primary metal.

What is difference between HASL and ENIG finish?

ENIG is a gold finish that uses nickel as an immersion bath. The chemical reaction between gold and nickel produces a smooth, hard surface that won’t chip or flake.

HASL is a surface treatment that combines electroplating and heat treatment to create a hard, durable finish on metal. It’s also known as “hot acid etching.”

FAQ about ENIG

FAQ about ENIG

How thick is ENIG?

This is a very important question for anyone who wants to know how thick ENIG is before they buy it or try to melt it down. In general, ENIG has a thickness between 4 and 7 microns (millionths of a meter). That means that it’s about as thick as water, which makes it very easy to work with when it comes time to melt down or refine your gold or nickel into something else.

Is ENIG conductive?

This question is often asked by individuals who are trying to figure out if they should use ENIG in the process of immersing gold.The answer is yes, ENIG is conductive. Some people even prefer using it over electrolytic gold because of its ease of use and low cost.

Is ENIG hard gold?

Yes, ENIG is hard gold. It’s most often used in jewelry and other jewelry manufacturing processes because it’s a more cost-effective way to get the look of 24k gold without the price tag.


It is an effective, high-performance process for the gold enrichment of low-purity nickel. The ENIG process combines the high volume and wide range of applications of electroplating with the variety and flexibility of immersion techniques.The key elements that make ENIG such a versatile process are its efficiency and ability to be applied in a wide range of industries—from food processing to aerospace—and its relatively low cost.



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