Zinc Corrosion Performance Guide

We are often asked on how to improve the service life of customer’s parts, so we have listed a rating of Zinc based options in the order of performance and an approximate guide based on our experience, but please note this varies with each individual part depending on its configuration.

ZINC CORROSION PERFORMANCE CHART
BASE COAT PASSIVATE TOP COAT NOTE HOURS TO WHITE HOURS TO RED DIN 50961 & 2 ref.
ZINC CLEAR TRIVALENT none 16 hrs 48 hrs Fe/Zn 5-12
ZINC BLUE TRIVALENT none 24 hrs 72 hrs Fe/Zn 5-12/B
ZINC YELLOW HEXAVALENT # none not RoHS compliant 72 hrs 144 hrs Fe/Zn 5-12/C
ZINC FULL TRIVALENT* none 72 hrs 240 hrs Fe/Zn 5-12/A
ZINC FULL TRIVALENT* LEACH & SEAL 120 hrs 384 hrs Fe/Zn 5-12/A/T2
ZINC FULL TRIVALENT* L & SEAL + TNT 144 hrs 480 hrs
ZINC NICKEL ALLOY FULL TRIVALENT* none 240 hrs 720 hrs Fe/ZnNi 5-12/A
ZINC NICKEL ALLOY FULL TRIVALENT* LEACH & SEAL 240 hrs 1,000 hrs Fe/ZnNi 5-12/A/T2
ZINC NICKEL ALLOY FULL TRIVALENT* MACULUBE 240 hrs 768 hrs Fe/ZnNi 5-12/A
ZINC NICKEL ALLOY FULL TRIVALENT* GLEITMO 240 hrs 768 hrs Fe/ZnNi 5-12/A
ZINC NICKEL ALLOY FULL TRIVALENT* TNT LUBRICATION 480 hrs 1,000 hrs
ZINC OPTIONS WITH BLACK FINISH
ZINC BLACK HEXAVALENT # TOP COAT not RoHS compliant 8 hrs 24 hrs
ZINC NICKEL ALLOY BLACK TRIVALENT TOP COAT 240 hrs 1,000 hrs Fe/ZnNi 5-12/F/T2
ZINC NICKEL ALLOY BLACK TRIVALENT MACULUBE 240 hrs 768 hrs Fe/ZnNi 5-12/F
ZINC NICKEL ALLOY BLACK TRIVALENT GLEITMO 240 hrs 768 hrs Fe/ZnNi 5-12/F
ZINC NICKEL ALLOY BLACK TRIVALENT BLACK TNT 480 hrs 1,000 hrs

Note – Full trivalent* also referred to as:

1) Thick film trivalent passivate

2) Heavy film trivalent passivate

Note # – Hexavalent passivates are only offered when it is specified and against our advice to change to a RoSH compliant alternative.