The biggest advantage of galvanizing components or the body of the vehicle is that it offers optimal protection against rust. Automobile manufacturers are also aware of this. With higher quality vehicles, there is the possibility that they are completely galvanized ex works. However, this is far from the rule for cheap vehicles and especially for individual components, even in the current time. Under certain circumstances, components and even the body can be galvanized afterwards. Starting from the simple zinc spray up to "real" galvanizing. It is particularly advantageous on parts of the body because it is most exposed to the environmental conditions and therefore very susceptible to rust.
Examples of galvanized components
Hot-dip galvanized steel has proven to be excellent on special vehicles and expensive vehicle components. Agricultural vehicles and slurry tankers in agriculture are very good examples of hot-dip galvanized steel and durability. Even in snow removal vehicles, many components that have direct contact with snow and road salt are galvanized in advance or afterwards. It has been shown that hot-dip galvanized steel offers protection against corrosion, even under extreme conditions.
the different types of galvanizing
Galvanizing is not the same as galvanizing, because here too there are different processes that offer corresponding advantages and disadvantages. Examples include galvanizing, hot-dip galvanizing, electrolytic galvanizing, cold galvanizing, spin galvanizing, high-temperature galvanizing, the anodizing (Galvanizing), diffusion galvanizing, mechanical galvanizing, film galvanizing and many more.
Example of galvanizing
The main steps in galvanizing are as follows:
- First, greases, lubricants, grinding dust, oils, chips and other foreign bodies or agents are boiled in a hot pool at a temperature of approx. 70 ° C.
- The component is then rinsed off.
- Next, rust and scale are removed from the component by pickling. In some cases, this process may need to be repeated several times.
- The last small impurities are removed from the component by electrolytic degreasing, i.e. with electricity. Impurities are blown away by bubbles that are created during the process. Then galvanizing can occur.
- The component is rinsed again immediately before the galvanizing.
- The zinc is deposited on the material in the zinc bath using electricity. At the anode, zinc that is as pure as possible is dissolved in the salt water of the zinc basin by using electricity. The component serves as a cathode and is immersed in the zinc bath. The layer thickness is usually eight to twelve µm.
- At the end the component is rinsed.
In some cases, galvanizing is performed by chroming or passivation applied to increase corrosion protection. The zinc layer is wetted with metal salt solutions. A special form of passivation is thick film passivation, which offers a particularly high level of corrosion protection. After passivation or chromating has been carried out, the component must be rinsed again. The component is then dried. The process and the effect are similar to that Copper and everything can be found under the heading Electroplate be summarized.
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