RC-25 Hard Chromium Plating Additives

INTRODUCTION

• The current efficiency of cathode current is up to 22-26%.

• Available current density can be up to 60 amp/dm² or more, thus the deposit rate is well improved.

• The RC-25 does not contain fluoride and does not corrode the low current area of the workpiece.

• The micro-hardness of the coating is up to 1000-1100KHN₁₀₀, the number of micro-cracks of the coating is up to 1000/inch, which improves the corrosion resistance.

• Smooth and bright coating.

• Uniform coating thickness, reduces over-thickness deposition at high current density.

• No etching of lead-tin anode, special anode/cathode material is not required.

• The pretreatment process, anode and plating tank are the same as the general traditional chrome plating process.

EQUIPMENT

Tank: hard PVC or steel tank lined with soft PVC, and ventilation equipment next to the tank is required.

Rectifier: require enough amperage loads lie on tanks, ripple ratio is less than 5%, voltage is greater than 15V.

Anode: lead-tin alloy (tin 7%)or lead-antimony alloy, auxiliary and pictographic anodes should also use lead-tin or lead-antimony alloy.

Heat system: titanium, lead or polytetrafluoroethylene.

Cooling pipe: titanium or lead.

Filter pump: material should be made of stainless steel or chromic acid resistant plastic.

ROLE OF ADDITIVES AND REPLENISHMENT

Make-up agent RC-25K is usually only used for new plating solutions, or for replenish of the loss of drag-outs.

RC-25R is used as a solution replenishment: 100 ml of RC-25R is added for every 1 kg of chromic anhydride replenish.

EFFECT OF IMPURITIES

Impurities that are detrimental to the general hard chromium solution also effect the RC-25. Too much impurity of trivalent chromium and metal (iron, copper, nickel) will result in the decrease of the conductivity of the bath and make the coating rough. The total impurity content should not exceed 7.5 g/l, also the chloride ion content should not exceed 100 pm.

SOLUTION UPDATE

The process of converting from traditional hard chromium plating to RC-25 is very simple. It only needs to analyze and adjust the content of metal impurities in the plating solution no more than 7.5 g/l, fluoride content less than 0.2 g/l, then adjust the content of chromic anhydride to 240 g/l, and finally add RC-25 according to the make-up amount.

SAFETY AND ENVIRONMENTAL

A Material Safety Data Sheet (MSDS) includes product safety instructions and environmental protection instructions. Read and review the MSDS for appropriate health and safety warning before use.

WARRANTY

1. We provide guarantee for product quality under the valid law.

2. The quality of the product after reprocessing or repackaging by customer is not included in the guarantee.

3. Please feel free to contact us if you have any questions or issues about the products, we are ready to answer at any time.

COLOR & PACKAGING

Make-up (RC-25K) is a brown-red liquid with plastic barrel packaging. The packaging specification is 25 kg/pcs.

Replenishment (RC-25R) is a brown-red liquid with plastic barrel packaging. The packaging specification is 25 kg/pcs.

?IMPORTANT NOTICE REGARDING THIS INSTRUCTION BOOK

The product information and recommendations contained in this document are based on our experimental theory and data. Due to the particularity of the surface processing, further as the actual use of our products by others is beyond our control, NO GUARANTEE of any kind is made as to the effects of such use, and NO RESPONSIBLE for any consequences. Also, all the information in this document cannot be used as evidence of copyright infringement.