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Rifles, Reloading, Optics, Equipment
Gunsmithing
Sandblasted SS treatment afterwards??
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<blockquote data-quote="westcliffe01" data-source="post: 1908481" data-attributes="member: 35183"><p>If you ever get carbon steel contamination onto a prized stainless item, you can remove the oxide and the underlying ferritic base material using citric acid. It's easy to get in powder form, its safe ( used on sour candy). </p><p></p><p>Make up a saturated solution using distilled water, stiring in the citric acid powder until it no longer dissolves. For stubborn contamination , use a toothbrush to scrub the area and you can warm a bit of the solution in a cup in the microwave to increase the aggression of the reaction. For quality control you can make up a copper sulphate solution and paint it on the area.. The copper sulphate will stain any ferrite base material on the surface. See caveats below before rushing off to do this however...</p><p></p><p>I personally have not tested 400 series stainless in the normalised or annealed condition (barrels and actions). So I do not know if the copper sulphate will work for those materials. I do know that for 420 stainless that has been hardened and tempered it works perfectly fine but that is because the heat treatment converts the ferritic grain structure to austenitic. Thus ignore the copper sulphate test for your barrel or action, it is fine for 300 series or hardened 400 series materials....</p></blockquote><p></p>
[QUOTE="westcliffe01, post: 1908481, member: 35183"] If you ever get carbon steel contamination onto a prized stainless item, you can remove the oxide and the underlying ferritic base material using citric acid. It's easy to get in powder form, its safe ( used on sour candy). Make up a saturated solution using distilled water, stiring in the citric acid powder until it no longer dissolves. For stubborn contamination , use a toothbrush to scrub the area and you can warm a bit of the solution in a cup in the microwave to increase the aggression of the reaction. For quality control you can make up a copper sulphate solution and paint it on the area.. The copper sulphate will stain any ferrite base material on the surface. See caveats below before rushing off to do this however... I personally have not tested 400 series stainless in the normalised or annealed condition (barrels and actions). So I do not know if the copper sulphate will work for those materials. I do know that for 420 stainless that has been hardened and tempered it works perfectly fine but that is because the heat treatment converts the ferritic grain structure to austenitic. Thus ignore the copper sulphate test for your barrel or action, it is fine for 300 series or hardened 400 series materials.... [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Sandblasted SS treatment afterwards??
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