RESPONSE 2 to QUESTION #2
The flux remaining on gold articles after hard soldering is tenacious and may be seldom removed by pickling or polishing. We have a stripping solution that is used at room temperaure at a potential of 2-3 volts.
The flux remaining on gold articles after hard soldering is tenacious and may be seldom removed by pickling or polishing. We have a stripping solution that is used at room temperaure at a potential of 2-3 volts.
SAMFA - QUESTIONS ON METAL FINISHING
If you have any inquiry related to metal finishing please feel free to post it here. We will publish all the answers received, and should you wish the answerer to communicate directly with you, we'll put you in touch
QUESTION #1
Currently our company is operating in platinum mines where there is a high content of chrome particles in the mine rock and silt. The nature of the environment is such that the chrome particles abrade through anything and everything that it mechanically can. The parts abraded are not yet coated with any protecting layer. I am tasked to investigate and try to conjure solutions to the agressive abrasion that the chrome causes. I would appreciate any tips, suggestions or contacts that I need to follow up on in order to guide us in this problem.
Currently our company is operating in platinum mines where there is a high content of chrome particles in the mine rock and silt. The nature of the environment is such that the chrome particles abrade through anything and everything that it mechanically can. The parts abraded are not yet coated with any protecting layer. I am tasked to investigate and try to conjure solutions to the agressive abrasion that the chrome causes. I would appreciate any tips, suggestions or contacts that I need to follow up on in order to guide us in this problem.
Submitted by: FRUSTRATED
Cape Town, South Africa
Cape Town, South Africa
QUESTION #2
We are a gold chain manufacturing concern, but have ongoing issues with removing excess solder at the point where the two links traverse each other. Is there someone out there that has a proven methodology of electro stripping that is cost effective yet economical? We use a tunnel for soldering of the links.
We are a gold chain manufacturing concern, but have ongoing issues with removing excess solder at the point where the two links traverse each other. Is there someone out there that has a proven methodology of electro stripping that is cost effective yet economical? We use a tunnel for soldering of the links.
Submitted by: MINING ENGINEER
South Africa
South Africa
RESPONSE 1 to QUESTION #2
It is possible that there may be a solution to your problem but more information is needed. The base material is assumed to be Gold but is it an alloy and if so what is the composition of the alloy? Similarly, what is the composition of the solder? These permutations have a bearing on the kind of stripping solution that may be suitable for the job. Can you provide more detail?
It is possible that there may be a solution to your problem but more information is needed. The base material is assumed to be Gold but is it an alloy and if so what is the composition of the alloy? Similarly, what is the composition of the solder? These permutations have a bearing on the kind of stripping solution that may be suitable for the job. Can you provide more detail?
Response from: TechRep
Johannesburg, South Africa
Johannesburg, South Africa
QUESTION #3
We are a hardchrome company and are experiencing problems with minute pitting on the ends of our shafts,Our solution is perfect and we are not plating at too high a current.Any ideas?
We are a hardchrome company and are experiencing problems with minute pitting on the ends of our shafts,Our solution is perfect and we are not plating at too high a current.Any ideas?
RESPONSE 1 to QUESTION #3
Pitted deposits are mostly caused from isolated particles of a stopping off material that is used that is still left on the shaft. Particular attention should made to the cleaning of the shafts and in general a good rub down should be done after etching with waterpaper to ensure a clean surface
Pitted deposits are mostly caused from isolated particles of a stopping off material that is used that is still left on the shaft. Particular attention should made to the cleaning of the shafts and in general a good rub down should be done after etching with waterpaper to ensure a clean surface
Response from: Andrew Veitch - ES Mowat & Sons
Manager Electroplating & Polishing
Durban. RSA Tel: 031-351274/5
Manager Electroplating & Polishing
Durban. RSA Tel: 031-351274/5
Submitted by: Lee White
Durban, South Africa
Durban, South Africa
Response from: Andrew Veitch - ES Mowat & Sons
Manager Electroplating & Polishing
Durban. RSA Tel: 031-351274/5
Manager Electroplating & Polishing
Durban. RSA Tel: 031-351274/5
QUESTION #4
Do you get matte nickel in the industry and is it possible to do matte nickel in a bright nickel tank, if so how?
Do you get matte nickel in the industry and is it possible to do matte nickel in a bright nickel tank, if so how?
Submitted by: Venero
Cape Town, South Africa
Cape Town, South Africa
RESPONSE 1 TO QUESTION #1
We have a thin dense coating called Armoloy that we can offer. The bond is absolute and the coating itself is 78HRc. It's also only 2-7 microns thick, and I'm not sure it will stand up to the conditions you are speaking about, but being 99% chromium it could be worth a try. We have had success in the mining industry in various applications, if you are interested I can offer a low cost trial. You can find more info at www.armoloysa.co.za
We have a thin dense coating called Armoloy that we can offer. The bond is absolute and the coating itself is 78HRc. It's also only 2-7 microns thick, and I'm not sure it will stand up to the conditions you are speaking about, but being 99% chromium it could be worth a try. We have had success in the mining industry in various applications, if you are interested I can offer a low cost trial. You can find more info at www.armoloysa.co.za
Response from: Clayton Conway
Durban, South Africa
Durban, South Africa
QUESTION #5
I am planning to install an integrated effluent and surface treatment plant (Phosphating and Chromate Conversion) at one of our sites. We are are thinking of recycling the water instead of sending to municipal sewer due to heavy metals involved.
1) What are the quality concerns and problems that can be expected when doing this?
2) Do you know of any tax benefits when doing this?
I am planning to install an integrated effluent and surface treatment plant (Phosphating and Chromate Conversion) at one of our sites. We are are thinking of recycling the water instead of sending to municipal sewer due to heavy metals involved.
1) What are the quality concerns and problems that can be expected when doing this?
2) Do you know of any tax benefits when doing this?
Submitted by: Dirk
Cape Town, South Africa
Cape Town, South Africa
RESPONSE 1 to QUESTION #5
Hi Dirk, sorry I can't help you with the tax enquiry, but I'm pretty sure you'll save some money with a recycling system in place.
Serfilco have had some experience with the filtration of post effluent plant water at platers in the UK, the main reason being to meet the stringent consent to discharge limits. In the cases where we have installed our Titan system our clients have been able to consistently recycle to non-critical rinses - see http://www.serfilco.com/pdfs/liturature/CH-48.pdf for a case history outlining details at an alkaline zinc facilty in Scotland. Hope this gves you some ideas, and you can call or e-mail me to discuss.
Hi Dirk, sorry I can't help you with the tax enquiry, but I'm pretty sure you'll save some money with a recycling system in place.
Serfilco have had some experience with the filtration of post effluent plant water at platers in the UK, the main reason being to meet the stringent consent to discharge limits. In the cases where we have installed our Titan system our clients have been able to consistently recycle to non-critical rinses - see http://www.serfilco.com/pdfs/liturature/CH-48.pdf for a case history outlining details at an alkaline zinc facilty in Scotland. Hope this gves you some ideas, and you can call or e-mail me to discuss.
RESPONSE 2 to QUESTION #5
The objective is by no means unachievable, but would require further discussion. Atotech, the company that I represent, is a world leader in eco-friendly chemistry. Please contact our offices directly for further information.
The objective is by no means unachievable, but would require further discussion. Atotech, the company that I represent, is a world leader in eco-friendly chemistry. Please contact our offices directly for further information.
Response from:
Rob Sawyer
Business Development Manager
Serfilco
Tel: +44 7960 624309
Rob Sawyer
Business Development Manager
Serfilco
Tel: +44 7960 624309
Response from:
Matthew Bronslow
Technical Sales Rep
Tel: 021 385 0030
Matthew Bronslow
Technical Sales Rep
Tel: 021 385 0030
RESPONSE 2 to QUESTION #3
Hi Lee, whilst I agree with Andrew that the pitting may be caused by deposits left on the work it is also possible that the pitting is caused by burining in the high current density areas at the shaft ends. Where we have encountered the issue before we have found the introduction of increased solution movement can overcome this. We would promote the use of an airless SerDuctor agitation system which can provide gentle solution movement and reduced burning. You can find details on our website by following this link: http://www.serfilco.com/pdfs/liturature/T-F143.pdf
Hi Lee, whilst I agree with Andrew that the pitting may be caused by deposits left on the work it is also possible that the pitting is caused by burining in the high current density areas at the shaft ends. Where we have encountered the issue before we have found the introduction of increased solution movement can overcome this. We would promote the use of an airless SerDuctor agitation system which can provide gentle solution movement and reduced burning. You can find details on our website by following this link: http://www.serfilco.com/pdfs/liturature/T-F143.pdf
Response from:
Rob Sawyer
Business Development Manager
Serfilco
Tel: +44 7960 624309
Rob Sawyer
Business Development Manager
Serfilco
Tel: +44 7960 624309
RESPONSE 3 to QUESTION #5
Hello Dirk. The recycling of Phosphate and chromate solutions can be done. The difficulty with this in Phosphate and Chromate lines is that you have alkaline and acidic solutions which need to be isolated at source. The costs of treating each solution needs to be calculated versus treating the effluent and discharging to municipal allowable limits which are lenient versus international standards.
As with any investment, The DTI will take a long term view of the project if there are sufficient funds and your company qualifies. You need to process this application with a consultant or directly with the DTI.
Please feel free to give me a call as this needs more discussion than via email.
Hello Dirk. The recycling of Phosphate and chromate solutions can be done. The difficulty with this in Phosphate and Chromate lines is that you have alkaline and acidic solutions which need to be isolated at source. The costs of treating each solution needs to be calculated versus treating the effluent and discharging to municipal allowable limits which are lenient versus international standards.
As with any investment, The DTI will take a long term view of the project if there are sufficient funds and your company qualifies. You need to process this application with a consultant or directly with the DTI.
Please feel free to give me a call as this needs more discussion than via email.
Response from:
Ray Orlik
Chemical Supply House
Tel: 082 375 6187
Ray Orlik
Chemical Supply House
Tel: 082 375 6187
RESPONSE 3 to QUESTION #3
Pitting in Hard Chrome is caused by several factors. Make sure that you are not confusing pitting with slight roughness.These are caused by different factors. If your ratio (Chrome: Sulphate)is correct for the solution you are using and you are jigging the work the same as always but getting this intermitadly, then be careful of the Chrome Mist suppressant you are using. An over addition with High foaming additives are known to cause intermittant pitting. Try reducing the addition to 50-75 ml/10000A/H. Max is 100 ml.
Pitting in Hard Chrome is caused by several factors. Make sure that you are not confusing pitting with slight roughness.These are caused by different factors. If your ratio (Chrome: Sulphate)is correct for the solution you are using and you are jigging the work the same as always but getting this intermitadly, then be careful of the Chrome Mist suppressant you are using. An over addition with High foaming additives are known to cause intermittant pitting. Try reducing the addition to 50-75 ml/10000A/H. Max is 100 ml.
Response from:
Ray Orlik
Chemical Supply House
Tel: 082 375 6187
Ray Orlik
Chemical Supply House
Tel: 082 375 6187
RESPONSE 1 to QUESTION #4
Pearl nickel is a commercially available finish. It needs a specially manufactured tank. Many platers make do with their existing tanks by running down the brightener or making a standard nickel solution with stress reliever and non pitter only. Please call me if you need further information.
Pearl nickel is a commercially available finish. It needs a specially manufactured tank. Many platers make do with their existing tanks by running down the brightener or making a standard nickel solution with stress reliever and non pitter only. Please call me if you need further information.
Response from:
Trudy Kastner
Supplier
Durban, RSA
083 281 9896
Trudy Kastner
Supplier
Durban, RSA
083 281 9896
RESPONSE 2 to QUESTION #4
As mentioned by Trudy there is a matt (or call it pearl) Nickel available, however you cannot run a combined Bright/Pearl Nickel in one tank. You will also have to consider whether you really need this system as the duller can be unstable and needs to be filtered out after production runs, you can extend this over months but it is more expensive to run than convensional bright. We recommend an overflow tank with filtration and bypass facilities and ideally a rocking mechanism. So after all this costs money and is ideally recommended to remove the duller off the plating tank surface to prevent marking and finally pitting. Hope this helps.
As mentioned by Trudy there is a matt (or call it pearl) Nickel available, however you cannot run a combined Bright/Pearl Nickel in one tank. You will also have to consider whether you really need this system as the duller can be unstable and needs to be filtered out after production runs, you can extend this over months but it is more expensive to run than convensional bright. We recommend an overflow tank with filtration and bypass facilities and ideally a rocking mechanism. So after all this costs money and is ideally recommended to remove the duller off the plating tank surface to prevent marking and finally pitting. Hope this helps.
Response from:
Struan Orlik - Krome
Chemical Supply House
JHB RSA
082 411 2427
Struan Orlik - Krome
Chemical Supply House
JHB RSA
082 411 2427
RESPONSE 2 TO QUESTION #1
Dear Sir, There are many products that have been in action in the past, however due to the nature of the environment, you will most unlikely not get away from the abrasion with any coating system such as paint bases. These are continuous application products. If the parts are small enough and are not entire tractors, one option is to take the components and electroless nickel plate them with a high phosphor content. Once heat treated they will give around 800 to 1000V. They are extremely corrosion resistant including abrasion resistant and coat in all corners of the parts. This may be expensive intitially but longer term many be the solution. Try some parts and put into application. It has been used on industrial pumps because of these properties. Call if you would like to find someone who is big enough to do the job.
Dear Sir, There are many products that have been in action in the past, however due to the nature of the environment, you will most unlikely not get away from the abrasion with any coating system such as paint bases. These are continuous application products. If the parts are small enough and are not entire tractors, one option is to take the components and electroless nickel plate them with a high phosphor content. Once heat treated they will give around 800 to 1000V. They are extremely corrosion resistant including abrasion resistant and coat in all corners of the parts. This may be expensive intitially but longer term many be the solution. Try some parts and put into application. It has been used on industrial pumps because of these properties. Call if you would like to find someone who is big enough to do the job.
Response from:
Struan Orlik - Krome
Chemical Supply House
JHB RSA
082 411 2427
Struan Orlik - Krome
Chemical Supply House
JHB RSA
082 411 2427
