I use a technical grade, but in this case food grade is likely more pure. 10 percent by weight would have that 5 lbs bag mix to around 6.25 gallons of water. We heat the tanks as it reduced the cycle time required.
Advanced Plating provides passivation of stainless steel to ASTM A967, QQ-P-35 & AMS 2700 including AAA passivation of 303 & 416 stainless steels.
advancedplatingtech.com
The above site covers much of what ASTM A967 calls out.
I do have a diving backplate made of 316 and the only spot I have corrosions issues is where I filed a sharp edge to prevent it from abrading the webbing.
The ASTM's follow on testing can get a bit ridiculous.
The leftover solution also makes a great wood brightener for fencing.
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