Weighing the equipment and identifying references.
PRE-PROCESSING CHECKS & COMPLIANCE
Checking the products’ aptitude for galvanisation:
Surface condition, dimensions, design, drilling.
Quantitative checks in line with the customer’s purchase order.
Customer’s contact details in case of compliance-related measures.
Use of well-adapted tools according to the parts in question (round bars, chains, multiple hooks, etc.).
Optimising drilling positions.
Its purpose is to remove all dirt and grease that would prevent surface iron oxides from dissolving.
Rinsing occurs after he degreasing process so as not to pollute the following stages.
Its purpose is to remove carbon deposits and other oxides on the steel’s surface.
Stripping is done using a hydrochloric acid solution diluted at room temperature, with added inhibiting agents to avoid the steel being attacked once the oxides have been removed.
Another rinsing phase is launched after the stripping, to wash the iron salts and acid traces from the parts, as they may pollute the next stage.
This helps avoid the steel from re-oxidising before being plunged into the zinc bath. Decomposing the flow helps enhance the iron/zinc metal reaction when delving the part into the zinc bath.
Drying is carried out in an oven, to avoid zinc projections when the part is plunged in.
The parts are then plunged in a molten zinc bath at 450°C. Immersion times vary according to the loads, dimensions and thickness of the parts: 3 to 4 minutes for parts with simple shapes, 10 to 15 minutes for more massive products or large-size hollow entities.
COOLING & QUALITY CONTROL
Visual control upon removal from the zinc bath (aspect, distortion, etc.).
Testing thickness in comparison with a sample.
Delivery of a control report upon request, completed in line with the NF EN ISO 1461 standard.