Gold-plating treatment of the high-frequency needle surface
Release date:
2022-03-10
Probes serve as the contact medium in electrical testing and are high‑end, precision electronic and hardware components. They find extensive applications in fields such as medical devices, aerospace, biotechnology, and computing. The materials and prices of different probe types vary accordingly. High‑frequency needle probes are typically made from beryllium copper, phosphor bronze, brass, SK4, and other materials.
As society and technology continue to advance, living standards are steadily improving, and devices such as smartphones, computers, automobiles, and smartwatches are becoming increasingly widespread—driving growing demand for test probes.
Probes serve as the contact medium in electrical testing and are integral components of electronic and hardware systems. They find extensive applications in fields such as healthcare, aerospace, biotechnology, and computing. The materials and costs of different probe types can vary significantly. High-frequency needle The materials mainly include beryllium copper, phosphor bronze, brass, SK4, and others. Today, I will primarily explain why the surface of high-frequency probes should be gold-plated.
In short, gold plating is used to prevent copper from rusting. The patina that forms upon corrosion increases electrical resistance and can compromise the probe’s stability and functionality.
Benefits of testing gold-plated high-frequency needles:
1. This gold-plated layer exhibits excellent ductility, is easy to polish, and offers superior resistance to high temperatures and discoloration. Gold plating over a silver layer helps prevent silver from tarnishing; gold‑alloy coatings can produce a wide range of colors, making them frequently used as decorative finishes for items such as jewelry, watch components, and works of art.
2. Gold plating features low contact resistance, excellent electrical conductivity, good solderability, strong corrosion resistance, and a certain degree of wear resistance (in the case of hard gold), and is widely used in instruments, printed circuit boards, integrated circuits, tube shells, electrical contacts, and other applications.
As society and technology continue to advance, people’s living standards are steadily improving, and devices such as smartphones, computers, automobiles, and smartwatches are becoming increasingly widespread, driving growing demand for probes. Today, I’d like to explain why the surface of high-frequency probes is typically gold-plated.
In short, gold plating is used to prevent copper from rusting. The patina that forms upon corrosion increases electrical resistance and can compromise the probe’s stability and functionality.
The gold-plated layer has a golden-yellow appearance and exhibits high chemical stability. It dissolves only in aqua regia and is insoluble in other acids. Gold exists in the +1 and +3 oxidation states; the standard electrode potential for Au⁺/Au is +1.68 V, and for Au³⁺/Au it is +1.50 V. On steel, copper, silver, and their alloy substrates, the gold coating acts as a cathodic coating, and porosity in the coating can compromise its protective performance.
High-frequency needle The gold-plating process:
Based on their process characteristics, there are two types: cyanide-free gold plating and cyanide gold plating. Sulfite gold‑plating solutions are widely used in cyanide‑free plating baths.
Depending on the concentration of the gold‑plating solution, there is electroplating bath. Such solutions are typically acidic and have a low gold content, ranging from 0.4 to 0.5 g/L. This plating bath is cost‑effective, resulting in minimal waste. The gold layer obtained from this bath exhibits a bluish‑gold hue, making it particularly suitable for mass‑produced, low‑cost small metal hardware items, such as buttons and belt buckles.
Gold‑plating solutions are classified according to their functions. Pre‑gold plating refers to the process of applying a preliminary gold layer in a specialized plating bath prior to the main gold‑plating step, after which the workpiece is transferred to the standard gold‑plating procedure. This is precisely the treatment involved in high‑frequency needle gold plating.
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