The cleanliness of the metal surface directly affects the quality of the plating. Therefore, it is important to ensure that the metal surface is clean and flat, and to remove oxides and impurities from the surface before electro-galvanizing
Author: Anna
Precautions for zinc electroplating mainly include the following aspects:
Surface preparation: The cleanliness of the metal surface directly affects the quality of the plating. Therefore, it is important to ensure that the metal surface is clean and flat, and to remove oxides and impurities from the surface before electro-galvanizing.
Selection of electroplating solution: Different metal materials are suitable for galvanizing using different electroplating solutions. Choosing the right plating solution can improve the quality and adhesion of the plated layer.
Control of current density: Current density is an important parameter that affects the uniformity and thickness of the plating layer. Reasonable control of current density can obtain uniform, dense coating.
Control of plating thickness: The thickness of galvanized plating will directly affect the corrosion resistance of the plating. Too thin a layer may not be able to protect the metal effectively, while too thick a layer may lead to problems such as surface cracking and peeling.
Temperature and time control: the temperature of the plating solution and plating time will also have an impact on the quality of the plated layer. These two parameters need to be reasonably controlled according to the specific process requirements.
Safety measures in the plating process: In the operation process, remove all tools and piles on the work site and equipment that hinder the activities to prevent the acid from splashing on the body. When adding acid, the acid should be poured slowly into the water, and it is forbidden to pour water into the acid to prevent the acid from splashing out and hurting people. Protective glasses should be worn when working to avoid direct contact of human skin with acid and alkali.
The process of galvanizing includes the following steps:
Cleaning: The metal surface to be galvanized is cleaned to remove surface dirt and grease, either chemically or mechanically, e.g., acid washing, alkaline washing and sandblasting.
Acid washing: After cleaning, some oxides or other impurities may still be present on the metal surface, which can affect the quality of the coating. Acid washing can remove these impurities and purify the surface by soaking the metal in an acid solution1.
Galvanizing: After cleaning, the metal is immersed in an electrolyte containing zinc ions, which, by the action of an applied electric current, forms a zinc deposit layer on the metal surface. This process is known as electroplating, and the two commonly used electroplating methods are hot-dip plating and cold plating.
Degreasing: After plating is completed, residual electrolyte and other impurities need to be removed from the metal surface. This step can be realized by water rinsing or acid washing