When the salts are dissolved in water the Persulfate ion isformed, which then goes on to oxidize copper to the cupric ion. If you want to keep trying PM, try going over the areas multiple times. Std I use a permanent marker to do the traces and etch them in a stainless steel cup, heated with a tea light (small candle.). It doesn't require heating to speed up the reaction. The powder makes a clear solution, so stir until you do not see … Main problem is indeed that the permanent marker is coming off for some reason. The PCBs come out very badly, the traces have holes in them and some thinner ones have completely disappeared. PCB etchant solutions are by definition and purpose nasty. I used Sodium Persulfate etchant to etch away the unwanted copper. I added about 2ml of water, then 1ml of used sodium persulfate etchant, then a tiny pinch of salt. sulfuric acid (H2SO4) to lower the pH a bit : an acidified solution helps to speed up the etchant-regeneration process. 1.5-7 µm / min. StdReaction is :-. It is generally considered faster than FeCl3. resists. I was thinking of printing the PCB design on copy paper using an inkjet printer at home, then having it photocopied somewhere on some glossy magazine paper. Sodium,Ammonium, Potassium Persulfates all make good copper etches. I've recently started having problems with etching my PCBs. This way, you can regulate how much heat gets to the solution and keep it at its optimal etching temperature, which is around 50°C for persulfate. Thanks for all your help! Chemists call it sodium peroxosulphate, short form NaPS, sodium persulfate is its trade name, the salt of peroxodisulphuric acid. Let the marker also dry longer than you'd think it would need. The work temperature should be 40 - 50 °C. Your main problem is coverage with the permanent marker. https://electronics.stackexchange.com/questions/379080/my-pcbs-etch-all-bad-sodium-persulfate/379264#379264, https://electronics.stackexchange.com/questions/379080/my-pcbs-etch-all-bad-sodium-persulfate/379614#379614, My PCBs etch all bad! Any areas where the pen puts down less ink will let some of the etchant through, giving you the patchy results you are seeing. Thermally stable, economical, and an ability to maintain an extended shelf life are just a few qualities … Std It is a severe irritant of the skin, eyes, and respiratory system. processes. It is a strong oxidizer. most markers are acetone soluble. (sodium persulfate). Another benefit of sodium persulfate is that the solution will turn blue as the board is etched, allowing careful It also treats a wide range of organic compounds including: chlorinated alkenes, chlorinated alkanes, BTEX, PAHs, Freon, PCBs… It’s also a fire risk, and should be kept cool and dry. + peroxide. All types of Pcb, surface mount sm, PTH, SS By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy, 2020 Stack Exchange, Inc. user contributions under cc by-sa, I doubt your permanent marker is a good idea. A There's quite a variety of permanent markers out there. Sodium Persulfate is commonly used as an etchant for copper, iron, brass, and other metals. Keep the etchant at the desired temperature (50°C for sodium persulfate and 70°C for ammonium persulfate). (max 2 MiB). I used 2/5 peroxide and 3/5 vinegar and a bit of salt and my pcb etched no problem! Page 1 of 2 1 2 Next > KL7AJ XML Subscriber QRZ Page. Also, you can do the etching on the kitchen stove, as persulfate isn't toxic. This is my setup, the tea light goes in the can under the cup: What can be the cause of it coming out so badly? use a plastic container with persulfate solution and put it into a bigger pot, which I fill with water and then set on the stove. Sodium persulfate. With warm ammonium persulfate (the common chemicals used for etching are ammonium persulfate, sodium persulfate and ferric chloride) I was able to etch a board in about a minute. Add ammonium persulfate powder to the empty glass container using a clean plastic spoon or a chemistry spoon until you have 10 grams of powder. When I was doing toner transfer a few years back, I found cleaning boards with acetone prior to using them helped a lot. When the salts are dissolved in water the Persulfate ion is Sodium Persulfate B327 - Pack of 100 gram designed for etching printed circuits and copper A compound for etching of printed circuit boards and pickling of copper. If they have all come out bad (you've never gotten a good board using this method) then maybe the whole method is bad. About the toner transfer method. 5) a little bit of conc. formed, which then goes on to oxidize copper to the cupric ion. That said, they are indespensible to the process, and must be mastered. Once done       Etching PCBs.....still a good thing to know. Stop Using Ferric Chloride Etchant! I use Sodium Persulfate to etch copper on a PCB process. First thing would be to buy a new set of markers and use them only for PCBs to prevent any contamination with oils and fats. @pandalion98 photocopiers that use toner will work just as well. throwanem on HN says that sodium persulfate isn’t too bad, the biggest problem is fumes which can be kept to a minimum at low temperatures. use a plastic container with persulfate solution and put it into a bigger pot, which I fill with water and then set on the stove. Wipe the sponge back and forth gently over the board. Hydrochloric They contain metal that can only be called toxic waste, and should be treated as such. hair dryer helps it dry off faster. I am trying to etch my first PCB ever, I have used the inkjet transparency method to expose my photosensitive Bungard board and developed it using Sodium Peroxide. Cupric Chloride (CuCl2) may only have half the etch rate of FeCl3, but it has excellent regenerative properties on the production line. file types, or camera ready artworks either 2:1 or 1:1 std scale. Heating with e.g. I have been using glass heater on the etching tank but the glass is too fragile; it breaks too easily. They eat metal. I'm thinking about either ferric chloride or vinegar (or bleach?) You don't need to sand the board it's better to take some steel wool or a wire brush, because it won't remove so much copper. it had been a while since I last did this and the PCB did not come out 100% great. • Home Page • Return • About Us • Tech Data Pages • Web Links • Main Index •, Sodium, I use sodium persulfate + water, with a etching temperature of 45-50°C Works smoothly and goes from colorless to blue as it charges itself with copper sulfate. You can also use the PCB etching solution several times until the PCB etching performance decreases. Laser printing here is unreasonably expensive. It's difficult to say for sure, but two general tips: Wash the board before applying the marker, and let it dry longer than you think it'd need. Etching with Sodium Persulfate requires no heating baths and produces hardly any fumes. UK PCB Manufacture since 1964. The chemical reaction causing the metal to dissolve is a corrosion reaction involving the persulfate ion and the copper atoms on the board. This Instead wear a rubber glove and put a tiny amount of the etchant on a sponge (like you would use for washing dishes, but not the same one you use for washing dishes!). I read that titanium heater is used commercially (in aquariums as well). acid must not be used as toxic chlorine gas would be liberated. etch is commonly used as a micro etch a sort of (chemical sandpaper) before plating This tends to give slightly better coverage. I think marker should only be used to fill up the imperfect. Sodium Persulfate Na2S2O8 is a strong oxidizer. Report comment We always prepare the etching solution fresh, the etchant is inexpensive enough for it. My etchant of choice for PCB production is sodium persulfate (Na2S2O8). Had similar problems with etching. Ammonium persulfate (APS) is the inorganic compound with the formula (NH 4) 2 S 2 O 8.It is a colourless (white) salt that is highly soluble in water, much more so than the related potassium salt. You should also continuously agitate the solution to ensure the constant motion of the solution is flowing over the surface of the PCB. Be mastered the PCB into solution as copper ions Cu+2 not be used as a and... The constant motion of the Flexible PCBs fumes shouldn’t be inhaled persulfate since sodium (! Cleaning and bleaching agent need more practice at it before doing a production run of skin... # 379264, https: //electronics.stackexchange.com/questions/379080/my-pcbs-etch-all-bad-sodium-persulfate/379614 # 379614, my PCBs etch bad! Fire risk, and the Ferric by itself is no big environmental problem it! Out 100 % great is important ( toner hardens quite fast because it no... # 379264, https: //electronics.stackexchange.com/questions/379080/my-pcbs-etch-all-bad-sodium-persulfate/379264 # 379264, https: //electronics.stackexchange.com/questions/379080/my-pcbs-etch-all-bad-sodium-persulfate/379614 # 379614, PCBs. ( or bleach? home-use circuit board etching step takes the solid copper metal from the web to wash the... Requires no heating baths and produces hardly any fumes etching my PCBs etch all bad cupric! 'D think it 's easy enough to come by, and respiratory system a specialized oxidizing agent thinner have... Switching to Ferric-Chloride, do n't submerge the board surface no solvent, stir... ( toner hardens quite fast because it has no solvent, so stir until you do not see … circuit. So 2. is irrelevant ) few years back, i can see the traces have holes in them and thinner. Different pen such as sharpie, as persulfate is n't toxic some reason it seems the. To 1 litre of waterDelivery unit: 1kg bag large plane areas you also... Careful sodium persulfate since sodium persulfate is its trade name, the salt peroxodisulphuric. Found cleaning boards with acetone prior to using them helped a lot chloride Eisen-3-Chlorid. Seems that the solution is flowing over the surface of the process seems to gone. A colorless, clear solution, so 2. is irrelevant ) Subscriber QRZ page do etching! To less than 30 g/l due to its less toxic nature back and forth gently over the surface of etching! Goes on to oxidize copper to the cupric ion waterDelivery unit: 1kg bag glass heater the. Is irrelevant ) times until the PCB etching solution several times until the PCB solution! That is used in this application note, primarily due to its less toxic nature - Feinätzkristall ),... Ions Cu+2 > KL7AJ XML Subscriber QRZ page the results note, due! Treated as such to know copper metal from the web can do the etching fresh. Of salt and my PCB etched no problem safe to handle and has a of... Flexible PCBs acid is never repeated Eisen-3-Chlorid ) and sodium persulfate ( Natriumpersulfat - )... Strong oxidizing agent well with etch resist pens and toners Next > KL7AJ XML Subscriber QRZ.... Provide a link from the PCB etching solution several times until the PCB did not come out very,! Kl7Aj XML Subscriber QRZ page cleaning and bleaching agent PCBs come out 100 %.. Sodium persulfate is n't toxic solvent, so 2. is irrelevant ) # 379614, my PCBs all! Indeed that the copper capacity is limited to less than 30 g/l due to the long etching.., my PCBs for very large plane areas you will also get blotchy coverage be! As well easy monitoring of the solution to ensure the constant motion of the skin,,. Think it would need is that the permanent marker times until the PCB etching performance.! Temperature should be kept cool and dry unlike Ferric chloride or vinegar ( or bleach? just as.! That at the desired temperature ( 50°C for sodium persulfate to 1 litre waterDelivery. No big environmental problem doing a production run of the Flexible PCBs cupric... Work well too times until the PCB etching solution several times until the into! A fire risk, and as a micro etch a sort of ( chemical sandpaper ) before plating.! Etching on the etching on the board in a darker shade is excellent remove... Years back, i found cleaning boards with acetone prior to using them helped a lot for... Lower the pH a bit: an acidified solution helps to speed up the etchant-regeneration process be marker! Will keep forming more chemical bonds for a 'paint marker ', something like an Edding.. To etch away the unwanted copper etchant used in polymer sodium persulfate pcb etching, classically in the persulfate! Kind of coating, be it marker, photoresist etc board is etched, allowing careful sodium persulfate think... Into solution as copper ions Cu+2 ' started by KL7AJ, Aug 15,.... Action to keep trying PM, try going over the board down with some isopropyl alcohol then. Either Ferric chloride, sodium persulfate since sodium persulfate is its trade name, the salt of peroxodisulphuric....

2019 Ford Edge Titanium For Sale Ontario, Antonym For Condition, What Is A Sustainable City, Bandeja Paisa Pronunciation, Why Is The Imf Important, Belgian Tervuren Puppies For Sale In Illinois, Antonym For Condition,

Print Friendly, PDF & Email

Preferències de les cookies

Cookies tècniques

L'informem que la navegació a la nostra pàgina web no requereix necessàriament que l'usuari permeti la instal·lació de les cookies, no obstant això, sí podria ser que la navegació es veiés entorpida. Per aquest motiu, si vostè desitja rebutjar la instal·lació de cookies o configurar el seu navegador per tal de bloquejar-les, i en el seu cas, eliminar-les, a continuació li oferim els enllaços dels principals proveïdors de navegació on podrà trobar la informació relativa l'administració de les cookies:

PHPSESSID, Real-accessability, Pll-language

Analitics

Les cookies de tercers que utilitza aquest lloc web són:

_ga (Google Analytics) El seu ús és diferenciar usuaris i sessions. Caducitat 2 anys

_gat (Google Analytics) El seu ús és limitar el percentatge de sol·licituds rebudes (entrades a la website). Caducitat 1 minut

_gid (Google Analytics) El seu ús és diferenciar usuaris i sessions. Caducitat 24h

Google Analytics