T.O.C removal



During normal production to Nickel plating baths chemicals are added with the purpose of obtaining brillant and levelled deposits. These organic additives are slowly degrading and increasing their concentration in the bath worsing the plating quality.
When their concentration outranges a limit value the bath becomes “brittle”, the corrosion resistance of the deposed layer become inferior and tipically plated pieces will non fullfill to specifications.

The easier method for evaluating the bath conditions is to measure T.O.C. (Total Organic Carbon) who gives the amount of organics in the baths.

When T.O.C. overages 22 – 30 g/l anomalies in the deposit becomes evident and appears like:
Brittle deposit
Deposit is difficult to Chrome plate
Opaque deposit in lower D.D.C. (current density)
Deposit is veiled and opaque
Lower corrosion resistance
Physical structure of deposit changes
Bigger chemical additives usage

CONVENTIONAL REMEDIES

Classical method of purification for a polluted Nickel bath is to add Hidrogen Peroxide and Active Carbon powder.

WEAKNESS POINTS

This treatment may only be performed during standstill or blocking production.
This process leads to big losses of electrolite who cannot be recovered, dirt filters to be disposed, polluting liquids from whashes that have to be treated in a waste water plant or be disposed.
Time and labour heavily adds to total costs.
Responsibles of the plating line will try to perform this process as less as they can.

OUR SOLUTION

Using a particular type of adsorber Polymer, we developed a process able to remove from a Nickel plating bath organic matter during normal production renewing the bath to the top efficiency.

Thanks to the particular Polymer used and to the tecnical construction of the unit we obtain a “selectivity” for degraded organics against “good” additives used for the production.

Using Idromax-Org, Nickel plating bath is always mantained in optimal conditions with great advantages on treated pieces quality and saving on consumption of expensive chemical additives.

HOW DOES IR WORK?

The Unit is principally composed of:
Circulation Pump
Safety Prefilter (50uM)
Adsorber Column(s)
Regeneration Column
Regeneration System

During normal production Idromax-Org is switched on when necessary.
In operation the unit removes degraded organics matters.
After a working period (to be defined at the startup) the “regeneration” of the polymer becomes necessary.
This operation uses modest quantities of Hydrocloric acid, Sodium Hydroxide and Hydrogen Peroxyde and removes from the Polymer the adsorbed Organics renewing it to the initial conditions.
Frequency of use and so frequency of regeneration is empirically calculated on the base of some analysis to be made at the startup (for example one two or more cycles per week).

RESULTS

T.O.C. can be mantained constantly at the optimal level for production.
Chemical “performances” are constantly at the “top” .
Parameter of brittening, leveling, brightness, deposit structure, ease of cromability are mantained at maximum values.