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Video title:

Make PCB Tinning Solution ("Liquid Tin") by Redox Flipping

Upload date:

November 11 2017

Uploaded by:

NurdRage

Video description:

In this video we make a tinning solution for printed circuit boards. Tinning solutions coat copper metal with a thin layer of tin. This is used to protect them from oxidation as well as make them somewhat easier to solder. To make the solution we first get 1g of lead-free tin solder containing 95% or more of tin metal. Check the MSDS to be sure. Now to the solder we add 10mL of 30% hydrochloric acid. What we're making is tin chloride. The solution will bubble hydrogen as the tin dissolves. Leave it overnight and pour off the clear supernatant into 100mL of commercial metal polish that contains thiourea. I used "Tarn-X" brand for my experiments. You can also buy thiourea directly and use 5g per 100mL of water directly along with 1g of sulfuric acid. Anyway, however you obtain your thiourea solution, the added tin chloride will make it into a tinning solution. Now just add in copper metal like that of a PCB and a thin layer of tin will coat it. What's happening is that normally Tin chloride does not displace copper metal so you can't make tinning solution from just tin chloride. One perspective is that Tin has a lower redox potential than copper so it would actually consume energy to displace copper. But thiourea forms very strong complexes with copper. This drives down the redox potential of copper to below that of tin. Now tin can displace copper. Donate to NurdRage! Through Patreon (preferred): https://www.patreon.com/NurdRage Through Bitcoin: 1NurdRAge7PNR4ULrbrpcYvc9RC4LDp9pS Glassware generously provided by http://www.alchemylabsupply.com/ Use the discount code "nurdrage" for a 5% discount. Social media links: Twitter: https://twitter.com/NurdRage Facebook: https://www.facebook.com/NurdRageYoutube/ Instagram: https://www.instagram.com/nurdrageyoutube/ This video generously sponsored by my patrons: Michael Zappe Cullen Purkis Simon Bitdiddle Matthew Brunette Alex S. Phillip Hutchings Emil Mikulic Lord Martin Hill Robert Boll Andrea Jacob Gruber Tyler Bushey Stephen Stair Michael Daniel Astbury Michael Gregg The King of Homestyle Wesley Gardner Bryan Boettcher Marius Klimantavičius Brian Nietfeld Martel DuVigneaud Max Loutzenheiser Anthony Rodriguez Antton Tapani Dror Kronstein Syam Krishnan Mark Rose Micha Gorelick Thor David Drueding Kay Bærulfsen ~SpiritToaster~ Craig M. Dom Vasta Craig House Iblis Rising Feliksas Marcio Yukio Teruya Timothy Vincent Danny Chan Miguel-Angel Gutierrez Casey Kikendall william tips Mark Beeunas Goodwine evan David Myndert Papenhuyzen Leon Verrall George Jefferies Jeffrey Morse jMe4505 Braxton Thomason Hy Diep Zane Bacon Ricardo Wolf Bennett Christian Cooper Akshay Joshi Martin Jæger Pedersen Michal Z rd Collin B Douglas CNK054so Timothy Glore Henry Wu Åsmund Tveten Dean Bailey Connor Reed Ben Anderson Applied Science David Gilmour Pascal De Lisio Jonathan Overholt Jason Brammer James McIlhargey Uocjat Mecha Chocobo Mark Keibler Evan Schuld Yuli Talyansky Chris M Guerra LFTRnow Marc Burns Daniel McLaughlin Paul Grodt Donald W Christian Ullrich Samuel Ytterbrink Bas Hessels Meagan McLay Daniel L. Daniel Åland Damien P Dean Leggo Mark Oberfield Grey Shot Joshua Books Sac LeGaie Aner Nitsan Xandorcode John Bonnin Jason King Joshua Crager Rebecca Chung cj6xu6ru Meyer Bill Noren Marc Ethier l.h. riley Greg Emmons Bear Essimage Trevor Joshua L Digiacomo Adrian Kleven Output Coupler Al Longley Jean-Marc Bélisle Curt Fischer Joe Szymanski Rauni Kangas John Wasser Paraffine Gawdwin Charles Harris Daniel Baizel Robert H. Guinn #Liberator12k Leonard Marshall Michael Aichlmayr Rescla Stephen dastrike T. Vladimir Vosselman Kristian Ferencik Project 54/74 Evan "Endar" Miller valgor7 Jordan Blackman Jordan The Gayest Person on Patreon Peculiar Pendulum Michael Kavulich Drea S. Joshua Graham Andrew Montagne Thomas Phipps Tristan Putzeys Tyler Faruque Ariesticnig Benedikt Müller William Greene Nova Kast Jason Hamilton-Smith Martins Latvis IncursionGerbil Chris Storer flugga Nicholas Alt nBoost Michael Chan Joshua Olson Jacob Weiss Johann Massyn Herbert999 Apollo Amy Damon Mr Stagger Lee Apocrypha Emil Lund Sean Walton SturdySolace Ivik Injerd Dylan Laws Jonas Abreu Randi Silva H Lambert Daniel Ekman Eric Johnfelt Louis Lan Sean Dawson Marc Banks Enrico Ferroni StevenG Christopher Wiita Munden Laird Rixford William Ching john esterer Andrew Hudson Bob Hayward Bennet Huch Mohammad AL-shubbar Gary Johnson Tommy Chris McCoy Nathan Towell Rémon Zander MrMonkey Michael Pearce Nael Jadoon Tom Haynes Yannik Neuhaus Keyz182 killroy225 spacekitteh Kieran Chambers Brendan Treanore Adam Schindler Jun Lem Wang Buck Hubach Rob Parker Daniel Baliki Joseph Tyson Z Batuhan Batu James Cahill John Bruce Derek Hsiao Jesse Mendoza Tom Farnell John Pollock Sam Smith Joel Rivers Mike Lambrakis George Burgyan William_Riker Derek Kipka Robert Robinette Phil Pemberton David Tiao Danielle Acacio Brian Vanderwaal Justin Corwin

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