Pickling - Revision history

DT Online: Created Template

2017-05-16T17:57:13Z

Created Template

← Older revision		Revision as of 17:57, 16 May 2017
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	=====Disposal=====		=====Disposal=====

	All '''Pickle Liquors''', even those based on vinegar for example, are contaminated with metal deposits and may be classified as [http://www.hse.gov.uk/waste/hazardouswaste.htm '''Hazardous Waste''']. The spent '''Pickle Liquor''' can be neutralised with [https://en.wikipedia.org/wiki/Sodium_bicarbonate '''Bicarbonate of Soda'''] and metallic deposits can be filtered out but users should seek Local Authority advice on its disposal.		All '''Pickle Liquors''', even those based on vinegar for example, are contaminated with metal deposits and may be classified as [http://www.hse.gov.uk/waste/hazardouswaste.htm '''Hazardous Waste''']. The spent '''Pickle Liquor''' can be neutralised with [https://en.wikipedia.org/wiki/Sodium_bicarbonate '''Bicarbonate of Soda'''] and metallic deposits can be filtered out but users should seek Local Authority advice on its disposal.Heat Treatment Buyers Guide.


			{{Heat Treatment Buyers Guide}}


	[[Category:Skills and Processes]]		[[Category:Skills and Processes]]

DT Online at 22:27, 15 May 2017

2017-05-15T22:27:53Z

← Older revision		Revision as of 22:27, 15 May 2017
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	=====Pickling Liquor=====		=====Pickling Liquor=====

	Traditionally, the acid pickle ''(i.e. '''Pickle Liquor''')'' used for '''Copper''', '''Brass''', and '''Silver''' in a 5% to 10% solution of [https://en.wikipedia.org/wiki/Nitric_acid '''Nitric Acid'''] or [https://en.wikipedia.org/wiki/Sulfuric_acid '''Sulphuric Acid'''] ''(i.e. one third the strength of car battery acid or less)''. [https://en.wikipedia.org/wiki/Sodium_bisulfate '''Sodium Bisulphate''']] is a less aggressive alternative now commonly used by craft workers - it is available as a pH Reducer for swimming pools and hot tubs ''(add about 250ml of powder to 5 litres of water)''. Much safer chemicals such as '''Citric Acid''' ''(15% solution)'', '''Alum''' ''(25% solution)'' and even '''Salt and Vinegar''' ''( 1 part salt to 8 parts water)'' can be used but these tend to be slower acting or have other disadvantages ''(e.g. '''Citric Acid''' will go mouldy if left)''.		Traditionally, the acid pickle ''(i.e. '''Pickle Liquor''')'' used for '''Copper''', '''Brass''', and '''Silver''', is a 5% to 10% solution of [https://en.wikipedia.org/wiki/Nitric_acid '''Nitric Acid'''] or [https://en.wikipedia.org/wiki/Sulfuric_acid '''Sulphuric Acid'''] ''(i.e. one third the strength of car battery acid or less)''. [https://en.wikipedia.org/wiki/Sodium_bisulfate '''Sodium Bisulphate'''] is a less aggressive alternative now commonly used by craft workers - it is available as a pH Reducer for swimming pools and hot tubs ''(add about 250ml of powder to 5 litres of water)''. Much safer chemicals such as '''Citric Acid''' ''(15% solution)'', '''Alum''' ''(25% solution)'' and even '''Salt and Vinegar''' ''( 1 part salt to 8 parts water)'' can be used but these tend to be slower acting or have other disadvantages ''(e.g. '''Citric Acid''' will go mouldy if left)''.


	A small amount of [https://en.wikipedia.org/wiki/Sodium_bicarbonate '''Bicarbonate of Soda'''] ''(aka '''Baking Soda''')'' mixed in a bowl of water can be used as a bath to neutralise the acid after pickling to halt its corrosive effects, but ensure that the workpiece and any tools used are thoroughly rinsed afterwards if they are to be placed back into the pickle bath - otherwise the acid will become weakened. The neutralising solution will bubble when the workpiece is placed into it if the solution is strong enough - simply add more bi-carb if this is not the case.		A small amount of [https://en.wikipedia.org/wiki/Sodium_bicarbonate '''Bicarbonate of Soda'''] ''(aka '''Baking Soda''')'' mixed in a bowl of water can be used as a bath to neutralise the acid after pickling to halt its corrosive effects, but ensure that the workpiece, and any tools used, are thoroughly rinsed afterwards if they are to be placed back into the pickle bath - otherwise the acid will become weakened. The neutralising solution will bubble when the workpiece is placed into it if the solution is strong enough - simply add more bi-carb if this is not the case.

DT Online at 22:23, 15 May 2017

2017-05-15T22:23:40Z

← Older revision		Revision as of 22:23, 15 May 2017
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	=====Pickling Liquor=====		=====Pickling Liquor=====

	Traditionally, the acid pickle ''(i.e. '''Pickle Liquor''')'' used for '''Copper''', '''Brass''', and '''Silver''' is a 5% to 10% solution of [https://en.wikipedia.org/wiki/Nitric_acid '''Nitric Acid'''] or [https://en.wikipedia.org/wiki/Sulfuric_acid '''Sulphuric Acid'''] ''(i.e. one third the strength of car battery acid or less)''. [https://en.wikipedia.org/wiki/Sodium_bisulfate '''Sodium Bisulphate''']] is a less aggressive alternative now commonly used by craft workers - it is available as a pH Reducer for swimming pools and hot tubs ''(add about 250ml of powder to 5 litres of water)''. Much safer chemicals such as '''Citric Acid''' ''(15% solution)'', '''Alum''' ''(25% solution)'' and even '''Salt and Vinegar''' ''( 1 part salt to 8 parts water)'' can be used but these tend to be slower acting or have other disadvantages ''(e.g. '''Citric Acid''' will go mouldy if left)''.		Traditionally, the acid pickle ''(i.e. '''Pickle Liquor''')'' used for '''Copper''', '''Brass''', and '''Silver''' in a 5% to 10% solution of [https://en.wikipedia.org/wiki/Nitric_acid '''Nitric Acid'''] or [https://en.wikipedia.org/wiki/Sulfuric_acid '''Sulphuric Acid'''] ''(i.e. one third the strength of car battery acid or less)''. [https://en.wikipedia.org/wiki/Sodium_bisulfate '''Sodium Bisulphate''']] is a less aggressive alternative now commonly used by craft workers - it is available as a pH Reducer for swimming pools and hot tubs ''(add about 250ml of powder to 5 litres of water)''. Much safer chemicals such as '''Citric Acid''' ''(15% solution)'', '''Alum''' ''(25% solution)'' and even '''Salt and Vinegar''' ''( 1 part salt to 8 parts water)'' can be used but these tend to be slower acting or have other disadvantages ''(e.g. '''Citric Acid''' will go mouldy if left)''.

DT Online at 18:23, 15 May 2017

2017-05-15T18:23:58Z

← Older revision		Revision as of 18:23, 15 May 2017
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	=====Safety Advice=====		=====Safety Advice=====

	* <span style="color: red">'''NEVER''' add water to concentrated acid - '''ALWAYS''' add acid to water in that order.</span>		* <span style="color: red">'''NEVER''' add water to concentrated acid - '''ALWAYS''' add concentrated acid to water in that order.</span> ''(an exception is when topping up the pickle bath because the acid has already been diluted)''.
	* <span style="color: red">Whatever equipment is used it must '''NEVER''' be later used for working with food!</span>.		* <span style="color: red">Whatever equipment is used it must '''NEVER''' be later used for working with food!</span>.
	* <span style="color: red">'''ENSURE''' the work area is well ventilated</span>.		* <span style="color: red">'''ENSURE''' the work area is well ventilated</span>.

DT Online at 18:21, 15 May 2017

2017-05-15T18:21:06Z

← Older revision		Revision as of 18:21, 15 May 2017
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	A small amount of [https://en.wikipedia.org/wiki/Sodium_bicarbonate '''Bicarbonate of Soda'''] ''(aka '''Baking Soda''')'' mixed in a bowl of water can be used as a bath to neutralise the acid after pickling to halt its corrosive effects, but ensure that the workpiece and any tools used are thoroughly rinsed afterwards if they are to be placed back into the pickle bath - otherwise the acid will become weakened. The solution will bubble when the workpiece is placed into it if the solution is strong enough - simply add more bi-carb if this is not the case.		A small amount of [https://en.wikipedia.org/wiki/Sodium_bicarbonate '''Bicarbonate of Soda'''] ''(aka '''Baking Soda''')'' mixed in a bowl of water can be used as a bath to neutralise the acid after pickling to halt its corrosive effects, but ensure that the workpiece and any tools used are thoroughly rinsed afterwards if they are to be placed back into the pickle bath - otherwise the acid will become weakened. The neutralising solution will bubble when the workpiece is placed into it if the solution is strong enough - simply add more bi-carb if this is not the case.

DT Online: Created article

2017-05-15T18:20:06Z

Created article

New page

[[File:PickleBath.png|250px|right]]
__TOC__

=====Description=====

[https://en.wikipedia.org/wiki/Pickling_(metal) '''Pickling'''] is the process of immersing metals in a diluted solution of acid ''(or an acid salt)'' in order to remove surface scaling and oxides created when heating metal, and the residue of fluxes following any [https://en.wikipedia.org/wiki/Soldering '''Soldering'''] operations.

=====Pickling Liquor=====

Traditionally, the acid pickle ''(i.e. '''Pickle Liquor''')'' used for '''Copper''', '''Brass''', and '''Silver''' is a 5% to 10% solution of [https://en.wikipedia.org/wiki/Nitric_acid '''Nitric Acid'''] or [https://en.wikipedia.org/wiki/Sulfuric_acid '''Sulphuric Acid'''] ''(i.e. one third the strength of car battery acid or less)''. [https://en.wikipedia.org/wiki/Sodium_bisulfate '''Sodium Bisulphate''']] is a less aggressive alternative now commonly used by craft workers - it is available as a pH Reducer for swimming pools and hot tubs ''(add about 250ml of powder to 5 litres of water)''. Much safer chemicals such as '''Citric Acid''' ''(15% solution)'', '''Alum''' ''(25% solution)'' and even '''Salt and Vinegar''' ''( 1 part salt to 8 parts water)'' can be used but these tend to be slower acting or have other disadvantages ''(e.g. '''Citric Acid''' will go mouldy if left)''.

A small amount of [https://en.wikipedia.org/wiki/Sodium_bicarbonate '''Bicarbonate of Soda'''] ''(aka '''Baking Soda''')'' mixed in a bowl of water can be used as a bath to neutralise the acid after pickling to halt its corrosive effects, but ensure that the workpiece and any tools used are thoroughly rinsed afterwards if they are to be placed back into the pickle bath - otherwise the acid will become weakened. The solution will bubble when the workpiece is placed into it if the solution is strong enough - simply add more bi-carb if this is not the case.

=====Equipment=====

All '''Pickle Liquors''' work more effectively if they are used warm. Specialist temperature controlled '''<dtamazon product="B009GG0Z9K" type="text">Pickling Units</dtamazon>''' are available but many craft workers use the less expensive '''<dtamazon product="B009H517PQ" type="text">Electric Slow Cookers</dtamazon>'''. It is important that these have ceramic and not metallic liners.

Use '''Brass''' or '''Plastics''' tongs and tweezers to retrieve workpieces from the pickle bath and remove all steel or iron binding wire before pickling - '''Ferrous Metals''' will contaminate and weaken most '''Pickle Liquors'''.

=====Safety Advice=====

* '''NEVER''' add water to concentrated acid - '''ALWAYS''' add acid to water in that order.
* Whatever equipment is used it must '''NEVER''' be later used for working with food!.
* '''ENSURE''' the work area is well ventilated.
* '''PROTECT''' hands with gloves, eyes with safety goggles and wear a good particulate face mask.
* '''ALWAYS''' wash hands after pickling.
* '''ALWAYS''' switch off heated pickle baths after use.

=====Disposal=====

All '''Pickle Liquors''', even those based on vinegar for example, are contaminated with metal deposits and may be classified as [http://www.hse.gov.uk/waste/hazardouswaste.htm '''Hazardous Waste''']. The spent '''Pickle Liquor''' can be neutralised with [https://en.wikipedia.org/wiki/Sodium_bicarbonate '''Bicarbonate of Soda'''] and metallic deposits can be filtered out but users should seek Local Authority advice on its disposal.

[[Category:Skills and Processes]]