Galvanisation can be applied by several methods, among which hot dip galvanisation and electro-galvanisation are the most commonly used. Both batch and continuous processes exist and are developed within the CRM Group.
The continuous galvanisation processes have been optimised in many ways using the pilot lines and other remarkable tools available at CRM group. Galvanisation, like other surface treatments, often largely rely on surface preparation and/or surface conversion steps, as can be highlighted with two examples. The SiO-grip concept (now Silicalloy®), originally developed for the final passivation step in galvanisation lines as an alternative to the chromatation treatment, has demonstrated remarkable surface conversion properties in many applications before painting. The CRM Group also recently developed the “Ferrigal” concept which consists in depositing a thin iron oxide film on the strip surface before annealing to significantly improve the later galvanisation results in the case of Advanced High Strength Steels (AHSS).
Industrial activities related to batch galvanisation still represent a large economic part of the manufacturing sector and thus remain of particular interest to the CRM group. With several of our Associated Members (UMICORE, Drever, etc) and with the financial support of the DGO6 (Walloon Region), we are currently developing an innovative process called “Evaplex”. After intensive trial campaigns on the pilot equipment built by CRM Group, the erection of a first industrial equipment (8m³ furnace) is under way.