TVC

Product name

TVC

Made in      

PPS - USA

Packaging

19 Liter/can

Description

The TVC Trivalent Chromium Plating Process was developed to meet the needs of an environmentally safer process than existing chromic acid based processes. 

In addition to the elimination of toxic hexavalent chromium in both the plating shop as well as the plating effluent, the TVC process tolerates current interruption without the production of dull deposits, has more uniform metal distribution, improved covering power and reduction of high current density burning.

Special graphite anodes are used in the TVC process resulting in long anode life and elimination of lead-containing sludge.

Micro Discontinuous as plated.

Improved covering power with excellent thickness distribution.

Functional for exterior applications.

TVC Base Compound.

The TVC Base Compound supplies the chromium and materials necessary to promote solution conductivity. TVC Base Compound is used at the time of solution make-up and for replenishment of solution losses by drag out. TVC Base Compound is replaced by measurement of the specific gravity of the solution assuming an optimum specific gravity of 1.210. As solution components are consumed, the specific gravity will drop and TVC Base Compound must be added back in order to return the specific gravity to the optimum value of 1.210. Measurement of specific gravity and additions of TVC Base Compound must be made only after all other solution adjustments have been performed. Generally, an addition of 3 oz/gal (22 g/L) of TVC Base Compound will raise the specific gravity approximately 0.01 units.

Additions of TVC Base Compound to the plating tank should be made slowly. Air agitation should be used to ensure the complete solution of the material and no un-dissolved material is present on the tank bottom.

TVC Base Compound is a green powder and contains chromic compounds regulated by OSHA. The 8 hour exposure limit for soluble chromic compounds is 0.5 mg chromium per cubic meter of air. As such, dusting should be minimized and good industrial hygiene procedures should be followed when handling powders such as local exhaust, protective clothing and eye protection, for example.

TVC Chromium Compound.

TVC Chromium Compound is used to replace the chromium plated from the solution based on the number of ampere-hours consumed since the last addition. TVC Chromium compound should be added prior to any adjustment of the bath with TVC Base Compound. TVC Chromium Compound should NOT be used to adjust the specific gravity of the solution. Additions of TVC Chromium Compound are added in a fashion similar to the TVC Base Compound described earlier.

It is important that the chromium concentration be maintained within the range specified. Generally, consumption of TVC Chromium Compound will be approximately 13-14 oz/1000 ampere-hours (370-400 grams/1000 ampere-hours) and should be added at least once every 15 ampere-hours/gallon (4 ampere-hours/) of operation.

TVC Chromium Compound is a dark green powder and contains chromic compounds regulated by OSHA. The 8 hour exposure limit for soluble chromic compounds is 0.5 mg chromium per cubic meter of air. As such, dusting should be minimized and good industrial hygiene procedures should be followed when handling powders such as local exhaust, protective clothing and eye protection, for example.

TVC Catalyst

TVC Catalyst allows for the plating of chromium from the trivalent form. Chromium can not be deposited without TVC Catalyst present in the solution. It is important that the concentration of TVC Catalyst be maintained within the range specified. Generally, the consumption of TVC Catalyst will be approximately 48 fl. oz./1000 ampere-hours (1400 mL/1000 ampere-hours) and should be added at least once every 15 ampere-hours/gallon (4 ampere-hours/litre) of operation. 

TVC MS

TVC MS serves as both a mist suppressant and as an aid to deposit distribution. Low TVC-MS can result in the production of dark smudges in the deposit, particularly on surfaces facing upward. High concentrations are not harmful. A minimum concentration must always be maintained in the solution. As a rule, the consumption of TVC-MS will be approximately 1-2 fl. oz./1000 ampere-hours (28-55 mL/1000 ampere-hours) and should be added at least once every 15 ampere-hours/gallon (4 ampere-hours/) of operation.

TVC EXT

TVC EXT assists in extending the current density range over which the chromium is deposited. It is used at the time of solution makeup and usually further additions are not required except in special circumstances. Additions should be made only on the advice of Plating Process Systems.