The Zinc process is applied in a (bass) drumand (static) frame system with average thicknesses of 8 / 12 microns in white, black and iridescent finishes, all of them exempt of Cr VI.
Its use is required for functional benefits and requirements of medium-high corrosion resistance, maintaining an excellent Price / Quality ratio and an optimal aesthetic appearance.
The system consists of a galvanic metal deposition in an alkaline or acid Zinc electrolyte; subsequently, white, bluish, iridescent, blue, or black passivation protects the Zinc coating from white corrosion.
An additional seal (Top Coat) that penetrates in the passivation ends up closing its micro cracks and pores and ensuring compliance with corrosion requirements.
The Top Coats applied are perfectly adapted to the prior passivations and, besides raising White Corrosion protection, they improve the aesthetic appearance and increase the surface hardness of the coating.
The coefficient of friction and torque for the fixing elements may be modified in accordance with the International Standards of the automobile industry and this is usually achieved with additives that are workpiece of the formulation of the Top Coats.
The ductility of Zn is pretty good accepting subsequent mechanical deformations to the coating in thicknesses that are not very high (Max 8 microns).
The application on heat-treated workpieces is excellent. The application in an acid electrolyte has the highest benefits.
The hydrogenation of the coating is minimal (especially in acid electrolytes) and the dehydrogenation is feasible on the workpieces once they have been passivated (except for Black Passivation), without affecting their resistance to subsequent corrosion.
The distribution of the coating is very good as well as the penetration in their interior.
Respects European Directive 2003/EC/53 and RoHS.
The Zinc process may be finished with any of these finishes or combining several of them:
ORGANIC TOP COATS
LUBRICANTS FOR COEFFICIENT OF FRICTION
PATCH NYLON, MICROENCAPSULATION, ETC*
* All Post finishes may be applied according to demand, some in subcontracting, with approved Suppliers & Partners with full logistics under the responsibility of GHSA
Resistance to Corrosion
96 to 250 hours without White Corrosion (According to thickness and subsequent Finishes)
Up to 600 h without Red Corrosion (With specific conditions of application)
24 h thermal shock at 180º
Applications for common elements of the automotive industry.
Aspect applications in automotive workpieces (Black Passivation)
Electrical components, construction, white line, etc.
VW TL 217
VW 13750 TL194 c696/c697
BMW GS 900100
PSA B154101 et B154102
RENAULT 0171002 et 47000
ZinKlad coatings Ford WX100 – S437
DIN 12329 o 50961
NOTE: This is general information and is not in any case of a contractual nature since it needs to be confirmed by the conduction of tests and trials on each workpiece individually.