and pdfThursday, December 17, 2020 4:39:30 AM5

Difference Between Electroplating And Electroless Plating Pdf

difference between electroplating and electroless plating pdf

File Name: difference between electroplating and electroless plating .zip
Size: 1771Kb
Published: 17.12.2020

With lead-free legislation impacting PCB manufacturing, immersion silver finish is adapted as one of the top finish of copper trace on PCB due to its many advantages. At the same time, driven by cost pressure, the silver electroplating is also considered to replace gold plating on electrical contacts of connectors. Therefore, there is a potential risk for silver finish to form electrochemical migration ECM under certain potential bias in high humid environment.

Different Types of Plating and Their Effect on the End Product

The primary difference with the nickel plating process is that EN does not require the application of an external electrical current to drive the deposition as does electrolytic nickel. Rather, EN uses a chemical reducing agent within the solution chemistry which results in nearly uniform deposition on all surfaces that are wetted by the EN chemistry.

Since the electrolytic nickel plating process requires the application of an externally applied DC current, the deposit tends to be non-uniform with excess deposit on the edges or corners high current areas of the part. An additional difference is that EN is an amorphous alloy of nickel and phosphorous. The addition of phosphorous provides the deposit with more corrosion resistance, less magnetic properties high phosphorous varieties and a lower coefficient of friction than electrolytic nickel.

The application of post-plate heat treatment of EN causes the formation of nickel phosphides at grain boundaries which further hardens the deposit to as high as 69 Rc. The plate is uniform across diameters, across threads and in dead end holes.

This property often eliminates the need for post-plate machining on critical dimensions. Figure 1 below shows two cross-sectional photos of two identical gears, one plated in electroless nickel and one plated in electrolytic nickel. The drastic improvement in uniformity of the deposit is very clearly seen. The top photos show the teeth of the gears, the bottom photos show the inner bore of the gear.

Note that EN plates completely within the bore. This process offers the same performance benefits of electroless nickel with a fully conductive black appearance. Call Us:

Electroplating vs Electroless Plating

The primary difference with the nickel plating process is that EN does not require the application of an external electrical current to drive the deposition as does electrolytic nickel. Rather, EN uses a chemical reducing agent within the solution chemistry which results in nearly uniform deposition on all surfaces that are wetted by the EN chemistry. Since the electrolytic nickel plating process requires the application of an externally applied DC current, the deposit tends to be non-uniform with excess deposit on the edges or corners high current areas of the part. An additional difference is that EN is an amorphous alloy of nickel and phosphorous. The addition of phosphorous provides the deposit with more corrosion resistance, less magnetic properties high phosphorous varieties and a lower coefficient of friction than electrolytic nickel. The application of post-plate heat treatment of EN causes the formation of nickel phosphides at grain boundaries which further hardens the deposit to as high as 69 Rc. The plate is uniform across diameters, across threads and in dead end holes.

difference between electroplating and electroless plating pdf

Electroless nickel-phosphorus plating

Real time monitoring of electroless nickel plating. This work deals with the design and manufacturing of the heat and chemical resistant transducer case required for on-line immersion testing, experimental design, data acquisition and signal processing. Results are presented for several depositions with an accuracy of two ten-thousandths of an inch in coating thickness obtained.

Electroless nickel-phosphorus plating is a chemical process that deposits an even layer of nickel - phosphorus 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 phosphorus-containing reducing agent , usually a hypophosphite salt. A similar process uses a borohydride reducing agent, yielding a nickel- boron coating instead. Unlike electroplating , electroless plating processes in general do not require passing an electric current through the bath and the substrate; the reduction of the metal cations in solution to metallic is achieved by purely chemical means, through an autocatalytic reaction.

The adhesion between electroless copper and a substrate is one of the most important factors in the reliability of thermoplastic printed circuit boards. The purpose of this paper is to investigate the effects of mechanical grinding and acid etching of thermoplastic substrate materials on the adhesion of copper deposited by an electroless copper plating process. The base material of the test substrates was a new high temperature thermoplastic polyphenylene oxide PPO compound.

Electroless (Autocatalytic) Vs Electrolytic Plating

Plating a substrate will enhance and protect the part making it more resilient and less prone to corrosion over time. There are many plating techniques available. Which technique you choose is dependent on your desired effect and application of the part being plated. In this article will be addressing the difference between electro-plating and electroless plating processes. So, what IS the difference between electro plating and electroless plating?

The added layer of metal protects the underlying core material from moisture while improving its appearance in the process. While there are numerous types of plating process, most can be categorized as either electroplating or electroless plating. Both types are able to add a layer of metal over a surface, but the way in which they do so varies.

Тучный немец, помахавший у него под носом рукой и сказавший на ломаном английском: Проваливай и умри. - С вами все в порядке? - спросила девушка, заметив, что он переменился в лице.

5 Comments

  1. Nacho R.

    17.12.2020 at 09:16
    Reply

    The question henri alleg pdf the question henri alleg pdf

  2. Charles I.

    18.12.2020 at 22:52
    Reply

    So, what IS the.

  3. Viracmidi

    20.12.2020 at 03:12
    Reply

    reddingvwclub.org › Metal Finishing Blog › Metal Plating.

  4. Russell L.

    21.12.2020 at 14:28
    Reply

    Copper, Nickel, Chromium, Tin, and most other metals provide mechanical protection, as long as the coating remains intact. If there are any defects in the plating.

  5. Reelsweapatpe1988

    23.12.2020 at 18:22
    Reply

    A clinical guide to blending liquid herbs pdf basic grammar in use raymond murphy pdf free

Your email address will not be published. Required fields are marked *