PROPERTIES 1. 2.
3. 4. Wide technique range and good covering ability. The throwing power can increase by 30~60%, the current efficiency is up to 22~24%, non-corrosion at the low current area.
HV hardness increases by 10~30%, the period of neutral salt-spraying test increases 1~2 times.
Low content of chromic acid, it is 40% of routine plating solution, lower the content of chromic acid in waste water, easy to be treated, high economic efficiency.
The technique is stable, easy to maintain. TECHNICAL FORMULATION & OPERATION CONDITION Chromic acid (CrO 3) Sulfuric acid (H 2SO 4) WR-1 Cr 3+ Temperature D K Anode Sk : SA 140~180g/L 0.4~1g/L 1~2g/L < 4g/L 25~70?C 5~60A/dm 2 Lead-Tin alloy plate (Tin content 8~15%) 1:3 below USING METHOD
1. Make-up of New plating solution:
Prepare the plating solution according to routine Chromium plating technique process, after that, add WR-1 into the solution, heat to 40 ~50?C and agitate the solution to make it completely dissolve, then try plating, generally current-pass treatment is unnecessary.
If the plating tank is a little bigger, make it activated by electrolyzing for 1-2hours before trying plating, Pay attention to the sulfuric acid(H 2SO 4) addition level, because some Chromic acid(CrO 3)contains higher SO4 2. The conversion of the old plating solution: 2- content itself. To old plating solution, sample it and analyse the SO42- content in old plating solution. According to the analyse result, use BaCO3 to make the redundant SO42- deposit, adjust plating solution to routine level, If much deposit exists in the bath for not to be filtered too long, excess BaCO3 must be added to make bath clean, fully agitate, filter or rest the solution over 12 hours, then take out the clear solution from the top level, adjust CrO3 and H2SO4 to the routine, then add WR-1 additive according to the above methods.
3. The daily replenishment of WR-1 additive:
Because WR-1 additive doesn't join electrodeposition process, the normal consumption is very few, mainly drag-out loss, according to test and production experience 1000Kilolitre of bath, two-shifts work replenishing level: 0.2 ~ 0.3kg/month more or less 4. If using WR-1 additive instead of Chromium plating additive from other supplier, first add measured BaCO3 and fully agitate, rest the solution over 12 hours, take out the clear solution from the top level, adjust H2SO4 and CrO3 content , then add WR-1 of 1/2 ~1/3 of the make-up bath volume.
WR-1 Additive for High Efficiency & Wide-range Temperature Chromium Plating