Re: Nickel Silver Tarnish/Corrosion Soaking in Acetic Acid (or vinegar if you prefer) plus the use of Semi-Chrome or Flitz (a metal polish with very small oxide particles for polishing) should do the trick.
You can reactively dissolve the NiO corrosion layer over metallic Ni by immersion in hot diluted acetic acid.
Vinegar and baking soda: Combine half a cup of vinegar with two tablespoons of baking soda in a bowl of lukewarm water. Submerge the silver items in the solution for at least thirty seconds and up to three minutes. Then remove them, dry them, and buff them with a microfiber cloth.
If heated to above 195°C, silver oxide decomposition occurs and yields separate silver and oxygen atoms. Additionally, silver ions can be released from silver oxide when reacting to the presence of nitric acid.
A good hand wash, exfoliator, body wash, or scrub can remove the stain immediately. It is beneficial in all situations, whether silver nitrate on the skin lasts long or causes a blackness around it.
If one needs to work with organic solvents, silver(I) oxide can be dissolved in trifluoroacetic acid (TFA) producing silver(I) trifluoroacetate AgOCOCF A 3 , which is a versatile reactant in organic synthesis (compact overview: [1]); also a precursor or chloride precipitant in the synthesis of metal complexes (see, ...
If you're in a hurry, baby wipes or a damp cloth will do the trick. If you have more time, an oil-based cleanser will help remove the sunscreen more completely. Be sure to wipe it well and avoid getting sunscreen in your eyes.
The process relates to a physical process which consists of a heating and a cooling process to separate the shell and the content (silver, silver oxide) of the spent silver oxide cell, so that silver oxide, silver and other metals such as zinc, iron and nickel can be recovered and reused.
For stubborn silver nitrate stain, diluted ammonia and hydrogen peroxide can be a great silver nitrate stain cleaner. Carefully use concentrated nitric acid to clean the stain on a benchtop or on the floor. Extreme care should be taken if administering this method.
Exposure to high levels of silver for a long period of time may result in a condition called arygria, a blue-gray discol oration of the skin and other body tissues. Lower-level expo sures to silver may also cause silver to be deposited in the skin and other parts of the body; however, this is not known to be harmful.
Plasma etching is the best way to remove oxides and other contaminants in high volume manufacturing. It is used by many different manufacturers, including automotive, aerospace, semiconductor fabricators, and PCB producers.
The results show that increasing the hydrogen peroxide concentration in the range of 0.5–2 M increases the dissolution of silver. However, at a concentration of 2–3 M, the dissolution rate decreases rapidly and is above 1.5 V due to the increasing reaction potential.
As mentioned by @Mockingbird, nickel oxide is somewhat soluble in potassium cyanide which will dissolve the oxide to form nickel cyanide, Ni(CN)2 and potassium tetracyanonickelate, K2Ni(CN)4 but potassium cyanide is very, very toxic.
Nickel plating is easily damaged by acid, so vinegar cleaning should be done sparingly on stubborn stains. You can heat up your mixture to give it a little more cleaning power if you desire.
You can dissolve nickel oxide by acids and NH4OH.
Silver oxide + Hydrogen peroxide → Silver + Water + Oxygen.
To quickly stop the effects of a silver nitrate applicator stick, apply a generous amount of 0.9% saline solution to the treated skin and then rinse with sterile water. Silver nitrate can also damage fabric.
It was discovered that the silver had a tendency to redeposit unto the fabric and actually restain the fabric. SUMMARY OF THE INVENTION Now in accordance with the present invention, silver nitrate stains are effectively removed from the fabric by bleaching with a chlorine bleach solution and redeposi- .
It is slightly soluble in water due to the formation of the ion Ag(OH)−2 and possibly related hydrolysis products. It is soluble in ammonia solution, producing active compound of Tollens' reagent.
Ammonia or hydrazine slowly react with silver oxide forming silver nitride or in the presence of alcohol, silver fulminate may also be produced [Bretherick 1979 p. 203]. Oxidation of magnesium is explosive when warmed with silver oxide.
To remove the oxide, the Nickel or Nickel alloy components should be dipped in the Superior PreFlux Nickel Cleaner a period of 1-30 seconds depending on the degree of oxidation. Room temperature or heated PreFlux Cleaner (up to 60°C/140°F) is recommended.
If your oxidation isn't particularly severe then you can get away with a more gentle polishing pad, but if the damage is heavier, you'll likely need to use a dedicated cutting pad. It's probably best to get a range of pads, so that you can switch them out as required.
Acidic solutions can break down and dissolve light oxidation and tarnish. They are composed of chemicals with a pH lower than 7 and include items such as lemon juice, white vinegar, and cream of tartar mixed with water.