PCB Surface Finishes - Implication on the SMT Process

ENIG (electrolessnickel/immersion gold) ImAg(immersion silver) ImSn(immersion tin) - Complicated Chemical Process, Clean 6 Chemical Steps; 20 chemical ingredients - Ni Thickness = 50-150 microinches - Au Thickness = 3-10 microinches ENIG picture source: Multek. ENIG: Soldering Two Intermetallics Intermetallic Intermetallic Electroless Ni Immersion Au ENIG PCB Solder Mask Copper

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PROCESSING GUIDE for PRINTED CIRCUIT BOARD MANUFACTUERS

PROCESSING GUIDE for PRINTED CIRCUIT BOARD MANUFACTUERS CT Florida CirTech, Inc. 1309 North 17th Avenue Greeley, CO 80631 Telephone: (970) 346 -8002 Fax: (970) 346 -8331 . Page 2 of 11 Revision: 09.22.08 Immersion Silver Processing Guide PRODUCT OVERVIEW Florida CirTech's Immersion Silver process plates a silver coating on

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Electroless nickel plating - Wikipedia

Electroless nickel plating (or EN plating) is a chemical process that deposits an even layer of nickel-phosphorus or nickel-boron alloy on the surface of a solid substrate, like metal or plastic.The process involves dipping the substrate in a water solution containing nickel salt and a suitable reducing agent.. Unlike electroplating, the process does not require passing an electric current

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Process Documentation Guide: Learn How to

Process documentation also helps easily automate processes when needed. Easy Starter Process Documentation Templates. Basically, process mapping helps represent the documented information like process steps, process roles, inputs and outputs in a streamlined picture.

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Immersion – Wikipedia

Immersion (lateinisch immersio „Eintauchen", „Einbetten") ist die physikalische Einbringung eines Objektes in Wasser und die damit verbundene Wechselwirkung, wird aber im übertragenen Sinne auch in anderen Zusammenhängen verwendet: . Immersion (Mathematik), eine Funktion mit injektivem Differential das Eintauchen eines Mondes in den Schatten eines Planeten, siehe Mondfinsternis

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Stripping of Plated Finishes | Products Finishing

The earliest alkaline chemical immersion stripping processes were cyanide based. Even with today's stringent regulations for handling, waste disposal and discharge, there are still a significant number of facilities that use cyanide-based technology for both plating and stripping operations. The major advantage of cyanide technology is that the chemistry dissolves most plated deposits while

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Problems & Solutions in ENIG (Electroless nickel

Problems & Solutions in ENIG (Electroless nickel / immersion gold) and ENAG Plating. A discussion started in 1996 but continuing through 2020. 1996. Q. I am looking for a brief description of processing and potential problems for immersion nickel and immersion gold. We are a manufacturer of printed circuit boards and have a need to install this

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Printed Circuit Board Surface Finishes -

Printed Circuit Board Surface Finishes: Advantages and Disadvantages. By Al Wright, PCB Field Applications Engineer Epec Engineered Technologies. Anyone involved within the printed circuit board (PCB) industry understand that PCBs have copper finishes on their surface. If they are left unprotected then the copper will oxidize and deteriorate, making the circuit board unusable. The surface

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Final finishing | Atotech

The process is qualified and in mass production for the world's leading cellular phone fabricators. AuNic ®: A drop-in process for existing standard ENIG lines. It consists of five main steps: cleaning, micro-etch, activation, electroless nickel and immersion Gold.

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Cyanide process | metallurgy | Britannica

Cyanide process, also called Macarthur-forrest Process, method of extracting silver and gold from their ores by dissolving them in a dilute solution of sodium cyanide or potassium cyanide. The process was invented in 1887 by the Scottish chemists John S. MacArthur, Robert W. Forrest, and William Forrest. The method includes three steps: contacting the finely ground ore with the cyanide

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Duden | Immersion | Rechtschreibung, Bedeutung, Definition

Definition, Rechtschreibung, Synonyme und Grammatik von 'Immersion' auf Duden online nachschlagen. Wörterbuch der deutschen Sprache.

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Processing, smelting and refining gold | World

Processing, smelting and refining gold. From ore to doré . Cyanidation. More gold is recovered by cyanidation than by any other process. In cyanidation, metallic gold is oxidised and dissolved in an alkaline cyanide solution. When gold dissolution is complete, the gold-bearing solution is separated from the solids. With ores of higher gold content (greater than 20 grams of gold per tonne of

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Gold Smelting Process | Sciencing

The first step in the gold smelting process occurs when ore containing gold is mined from the earth. At this point, the crude binding matter and the gold metal need to be separated. This is accomplished by pulverizing or crushing the gold ore, and then placing it in a furnace. The furnace must reach temperatures in excess of 1064 degrees Celsius, in order to elevate the gold above its melting

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ENEPIG Printed Circuit Boards - Epec

ENEPIG Printed Circuit Boards ENEPIG (Electroless Nickel Electroless Palladium Immersion Gold) ENIG is not generally considered to have an acceptable process window for high reliability gold wire bonding (although it has been used for some lower end consumer applications) and ENEG suffers from many of the same process cost issues as electrolytic nickel gold, with additional challenges from

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Comparison of ENIG and ENEPIG on techniques,

Compared with immersion gold solution (pH=4.5-5.5) of last generation, new-generation immersion gold solution is close to be neutral with a pH value in the range from 7.0 to 7.2. Neutral liquid performs best in stopping hydrogen ion corroding nickel surface. Moreover, new-generation immersion gold technology can be implemented in lower gold solution, which makes the cost of initial raw

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Metal Plating: Process & Techniques - Weld Guru

Metal Plating (see below for descriptions): electroless plating (autocatalytic) electroplating; Immersion plating; Finishing and Protection Treatments: phosphating; chromate conversion; anodizing; Typical Steps in Electroplating Process. The process shown below takes about 90 minutes to complete. This is the process for plating steel aerospace

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ACHIEVING A SUCCESSFUL ENIG FINISHED PCB UNDER

ACHIEVING A SUCCESSFUL ENIG FINISHED PCB UNDER REVISION A OF IPC 4552 MACDERMID ENTHONE Martin Bunce MacDermid Enthone Waterbury, CT USA [email protected] Lenora Clark, John Swanson MacDermid Enthone Waterbury, CT USA ABSTRACT The 4-14 IPC Standards Committee recently created a revision to the IPC4552 specification for Electroless Nickel/Immersion Gold

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BOLD Immersion – Build your future with Google

BOLD Immersion is designed to expose historically underrepresented students in this field to career opportunities in the industry. Students from all schools and students who identify with a group that is historically underrepresented in the technology industry, including but not limited to Black/African American, Hispanic/Latinx, American Indian, students with disabilities, and veterans are

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The Characterization of Al Bond Pad Surface Treatment in

This step applied to most of the methods in making interconnections from the bond pad on the Integrated Circuit (IC) die to the leadframe. In electroless nickel immersion gold (ENIG) UBM process

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Electroless Nickel Immersion Gold Process

Electroless Nickel Immersion Gold Process # PROCESS STEP TEMPERATURE DWELL TIME 1 ENIG PC300 Cleaner Alternately: CK300 Cleaner 90 – 120 F (120) 32 – 49 C (49) 3 – 5 min (4) 2 DI water rinses 2x counterflow Room temp. 1 - 2 min in each 3 Micro etch: CirEtch 130 70 – 90 F (80) 21 – 32 C (26) 1 – 2 min (2) 4 DI water rinses 2x counterflow Room temp. 1 - 2 min in each 5 Pre-dip

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