Basic Electroplating Knowledge归档 - Metal Fitting-Metal Fitting

100 Questions on Basic Electroplating Knowledge (Part 6)

2025-04-23

26.Known current density and plating time, how to find the thickness of the plating layer? Answer: First of all, according to the type of plating the current efficiency of the process, while checking the table to get the electrochemical equivalent of the metal and the density (specific gravity), and then calculated according to the following formula: ■ Plating thickness d formula (d: microns).Plating thickness d formula (d: micron)d=(C×Dk×t×ηk×100)/(60×r)■Plating time t calculation formula (t: minutes)t=(60×r×d)/(C×Dk×ηk×100)■Cathode current density Dk calculation formula (Dk: A/dm2)Dk=(60×r×d)/(C×t×ηk×100)■Cathode current efficiency calculation formula:ηk=(60×r×d)/(C×t×Dk×100)C=electrochemical equivalent (g/ampere-hour)Dk=cathodic current density (amperes/square decimeter)t=plating time (min)ηκ=cathodic current efficiency (%)r = plating layer metal density (g / cm 3)Example: nickel plating solution is known to be 95% current efficiency, cathode current density of 2.5A / d ㎡, plating 20 minutes after the resulting thickness of the plating layer is how much? Check the table to get the nickel electrochemical equivalent of 1.095 density 8.8d = (C × Dk × t × ηk) / 60r = 1.095 × 2.5 × 20 × 95% × 100 / (60 × 8.8) = 9.85um 27.What are anodic and cathodic plating, and for iron substrate, zinc, copper, nickel, chromium, copper-tin alloy, etc. plating belongs to that category of plating? Answer:According to the electrochemical relationship between the plated metal and the base metal, the plating can be divided into anodic plating and cathodic plating, under general conditions, the electrode potential of the plated metal is negative than that of the base metal, it is called anodic plating, and vice versa, it is called cathodic plating. Zinc plating electrode potential than the electrode potential of the iron substrate is negative, so the zinc plating is anodic plating. Copper, nickel, copper-tin alloy plating potential than the potential of the iron substrate is positive. Therefore, it is cathodic plating. Chromium plating according to…

100 Questions on Basic Electroplating Knowledge (Part 5)

2025-04-23

21.What is electrolysis? Answer:When the electric current passes through the electrolyte, the redox reaction occurs on the electrode so that the electrolyte is decomposed under the action of the current is called electrolysis. When the electrolyte is energized, the cations move to the cathode, and get electrons at the cathode and be reduced to a new substance; anions move to the anode, and lose electrons at the anode and be oxidized to a new substance. Sometimes the oxidation of the electrode material also occurs at the anode. An example is the electrolysis of molten sodium chloride.NaCl→Na++Cl-Cathode Na++e→NaAnode 2Cl–2e→Cl2↑Electrolysis industry plays a huge role in the national economy, the smelting of many non-ferrous and rare metals, the preparation of chemical industry products and electroplating, electropolishing, anodic oxidation and so on are realized by electrolysis. Translated with DeepL.com (free version) 22.What is electroplating? Answer: By electrolysis, in the metal parts on the surface of the deposition of a thin layer of other metal methods, it is called electroplating. Plating includes pre-plating treatment (oil removal, rust removal), plated metal layer and post-plating treatment (passivation, dehydrogenation) and other processes. It is used to prevent corrosion of metal products, repair worn parts, increase durability, reflectivity, electrical conductivity and aesthetics. Plating will be metal parts as the cathode, the plated metal plate or bar as the anode, respectively, hanging in the copper pole bar above the electrolyte containing plating components immersed in the direct current.In individual cases, there are also insoluble anodes, such as chromium plating with lead or lead-antimony alloy anode. 23.What is current strength? Answer:Current strength, referred to as current, is the amount of electricity passing through the cross-section of the conductor per unit time. The unit is ampere, referred to as ampere (A). 24.What is the current density? How to calculate? Answer:Current density…