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The customized and dimensionally stable Platinode achieves high-quality coating results.The platinized titanium or niobium electrodes enable a uniform coating thickness distribution on the workpiece, which does not require any postprocessing. Added to this is a long service life. All photos courtesy of Umicore Metal Deposition Solutions
The use of platinized titanium or niobium anodes in hard chrome plating has many benefits over its counterpart, lead anodes. According to Umicore Metal Deposition Solutions, a manufacturer of platinized titanium anodes, this product not only results in a more uniform and higher quality deposition but also significantly reduces investment costs compared to using lead anodes and without any additional effort from the user. Energy savings, higher quality and longer service life are some other advantages. Looming lead-processing regulations is another argument to replace lead anodes with platinized titanium anodes.
Specially developed for hard chrome processes, Platinode HC, platinized titanium or niobium anode from Umicore, is designed using high-quality electrocatalytic coating processes (high-temperature electrolysis). Because the product is more environmentally friendly, it is classified for government subsidies in Germany. The company offers the application for the subsidy as a free service and is working to offer this service in all other relevant European countries.
With Platinode HC&#;s tailor-made electrodes, high-quality coating results are achieved, according to the company. Its design enables a uniform coating thickness on the workpiece, which does not require any postprocessing
The investment in the Platinode HC pays for itself in the second year because of the government subsidy, the energy savings and the elimination of lead chromate disposal. The reusability of the individually manufactured electrode design, which can simply be replatinated after an average of five years when the platinum layer wears off, has a positive effect on the overall calculation.
because of the dimensional stability of platinized titanium anodes and the high-temperature electrolysis (better than aqueous deposition). The high-temperature electrolysis enables a 99.99% pure platinum layer as well as high adhesive strength and ductility.
The Umicore product in all versions has a high adhesive strength, corrosion resistance and ductility and thus an above average service life. According to the company, it has about five times the service life than that of a commercial lead anode. The investment pays for itself after about three years, but in the case of energy-intensive hard chrome plating, return on investment (ROI) would be likely in the second year because of the possible government subsidy, the energy savings and the elimination of lead chromate disposal.
The engineering firm, Delta Engineering and Chemistry GmbH, has investigated and performed a comparative analysis of Platinode HC and lead anodes in terms of energy efficiency and savings in laboratory conditions. It was found that a 1-to-1 replacement of lead anodes by the platinized titanium anode produced energy savings of at least 2.7% because of improved electricity conduction of the platinum coating.
Factors that are more difficult to measure, such as a more efficient workflow, the reduction of maintenance measures and the resulting production downtimes are other considerations. The same goes for the reusability of the customized electrode design, which can simply be replatinated after the platinum layer wears out. ROI does not include the cost and time incurred by official requirements for lead anodes.
These benefits, paired with problematic use of lead anodes in hard chrome plating for suppliers, makes platinized titanium anodes a more desirable choice. In fact, the lead chromate produced during hard chrome plating is
Hard chromium plating with lead anodes produces lead chromate, which is highly hazardous to water, carcinogenic and toxic to reproduction. Reducing the distance between anode and cathode and thus saving energy is not possible with conventional lead anodes due to deformation.
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classified in Germany as &#;highly hazardous to water&#; (the highest possible classification) and can even trigger natural disasters. In addition, the waste product is classified as carcinogenic and toxic to reproduction. The European Chemicals Agency has included lead chromate in the candidate list of Substances of Very High Concern.
These and other assessments are leading to increasing regulations of lead-processing companies worldwide. There are already time-consuming and costly hurdles in the procurement of lead for further processing, for example, through registration with the U.S. Environmental Protection Agency (EPA). Conversely, there are often numerous obstacles in the disposal of waste &#;quantitative levy regulations or the associated costs. The procurement of lead and the disposal of the resulting waste products such as lead chromate sludge is likely to become increasingly complicated and expensive until a possible ban.
Also, because of health hazards, stricter regulations are also becoming important to occupational safety, as can be seen from the reaction of the U.S. Occupational Health and Safety Association (OSHA). The requirements for the protection of employees (cleaning equipment, protective clothing, medical check-ups and so on) are becoming more extensive and thus more costly. The long-term goal of all measures is to eliminate lead from industrial processes through concerted global efforts.
Because Platinode HC avoids carbon dioxide emissions due to the lower electricity demand compared to lead anodes, as much as 40% of the investment in the product can be subsidized in Germany by the Federal Office for Economic Affairs and Export Control (BAFA). This includes a maximum of 300,000 euros over a period of three years. Corporate groups can reduce their investment by 700 euros and small and medium-sized companies by 900 euros per metric ton of carbon dioxide.
The fact that Umicore mediates the application process without additional costs saves the time of applying for the subsidy, saves mediation of an independent energy consultant to submit the subsidy application, and saves time, energy and costs that are necessary when using a verification procedure for carbon dioxide savings confirmation.
A few years ago, Wilhelm Bauer GmbH and Co. KG, which has specialized in the finishing of metallic surfaces since , decided to replace the lead anodes in a small hard chrome bath with a custom-made Platinode HC.
&#;The investment has paid off,&#; reports Jan Bauer, managing director of the Hannover-based company. &#;The experience with the platinized titanium anodes has been very positive, and the savings of about 10% in energy costs and our more positive carbon dioxide balance speak for themselves.&#;
Wilhelm Bauer GmbH could reduce its investment costs for Umicore's platinized titanium anodes by around 36% because of energy savings and government subsidies.
Since energy costs have risen steadily in recent years, the decision was made in to retrofit the significantly larger baths. The goal is to gradually replace the more than 200 lead anodes with Platinode HC. An application for funding was submitted to the BAFA through its energy consultant.
At the beginning of , the first 24 customized anodes with an impressive length of over 6 meters were installed at the facility and production was successfully started. The effect of the replacement stage is just as impressive: Wilhelm Bauer consumes 87,121 kWh less electricity per year as a result. Also, the company reduces its carbon footprint by 63.8 metric tons. By comparison, well over 5,000 mature beech trees would be needed for an equivalent carbon dioxide offset.
Based on the amount of carbon dioxide saved, the company can also count on a grant from BAFA of around 57,500 euros. This would put the investment costs of just under 275,000 euros into perspective, or around 36% of the total is expected to be financed by energy savings and subsidies.
"From an economic point of view alone, an end to the use of lead anodes in hard chrome plating can already be expected in the medium term,&#; says Christian Kurrle from the Umicore sales team. &#;Durability, efficiency, energy-saving potential and now the anticipated subsidy for Platinode HC bring monetary competitive advantages that cannot be compensated for by users of lead anodes.&#;
What Anodes are Used for Hard Chrome Plating?
Traditional anode for hard chrome plating is made of special lead alloys. Pure lead anodes are attacked by the solution and cause the formation of excessive amounts of lead chromate sludge.
A typical alloy is a lead-tin alloy. When the length and weight of the anode is a problem, anodes are usually lead antimony. Tin-lead anodes have better conductivity and last longer, but antimony-lead anodes are more rigid. Anodes used in high fluoride baths should use the tin-lead alloy, as antimony-lead alloys will have a poor life expectancy and form an abundance of corrosion products. Also, when tank type anodes are used in high fluoride baths, they should be of the solid smooth variety and not hollow or ribbed.
Except for lead alloy anode, iron anodes have occasionally been used, particularly in special instances where greater strength and rigidity are required. Their continued use, however, leads to the accumulation of iron and chromium in the bath. Where iron anodes are used, it is recommended that they be coated with lead whenever feasible. Small platinum wire anodes can also be used for special purposes, such as plating the inside of very small openings, but they too will form chromium in the bath. Copper, nickel, and stainless steel should not be used for chrome plating anodes.
Recently, platinized titanium and niobium anodes have been used more and more in fluoride free hard chrome plating baths, replacing the common lead and lead alloy anodes. This platinized titanium anode can increased throughput with reduced plating times. The Anode geometry remains constant to obtain optimized plating results, it has long operating life, very low maintenance, and can increased bath life.
For most plating situations, the anodes are usually shorter than the cathodes. This tends to decrease the excess current that would otherwise flow to the work at the bottom of the rack. The bottom of each anode should be at least 6" above the bottom of the plating tank. When the part contains sharp, narrow recesses, such as grooves, a reduction of the anode distance may help to increase the thickness of the deposit at the bottom of the grooves. However, some parts with sharp-cornered grooves, bosses, and undercuts cannot be uniformly covered unless conforming or auxiliary anodes are used.
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