Formula 1: Stainless Steel Surface Dust Removal Solution
| Ⅰ | Ⅱ | |
| Nitric acid | 50% (volume fraction) | 一 |
| Hydrogen peroxide | 一 | 30—60g／L |
| Water | 50% (volume fraction) | 15—25m/L |
| Time | 10/20 | 30-60 years |
| Ⅲ | Ⅳ | |
| Chromic anhydride | 70~100g／L | 100—150g／L |
| Sulfuric acid | 20—40g／L | 40-60g/L |
| Sodium Chloride | 1~2g/L | 4—6g／L |
| Time | 2~10min | 5 to 10 minutes |
After stainless steel is acid etched to remove oxide scale, residual carbon ash can be eliminated using the chemical method mentioned above.
Formula 2: Martensitic Stainless Steel Pickling Process
| Ⅰ | Ⅱ | |
| Hydrofluoric acid (relative density 1.1) | 27mL／L | 一 |
| Nitric acid (relative density 1.42) | 210-280mL／L | 140×150 mL／L |
| Phosphoric acid (relative density 1.70) | 一 | 100×120 mL／L |
| Temperature | room temperature | room temperature |
| Time | 5—10min | 5—10min |
Formula 3: Nickel-Chromium Stainless Steel Pickling Process
| Ⅰ | Ⅱ | Ⅲ | |
| Sulfuric acid (relative density 1.84) | 80~100g/L | 300~400g/L | 一 |
| Nitric acid (relative density 1.42) | 130~170g/L | 一 | 一 |
| Hydrofluoric acid (relative density 1.1) | 40~70g/L | 80~140g/L | 130~140g/L |
| ferric sulfate | 一 | 一 | 300~330g/L |
| Temperature | room temperature | room temperature | 65~70°C |
| Time | l5~30min(Unblown sand) 1~3min(Blown sand) | 15~45min | 20~30min |
| Ⅳ | V | ||
| Sulfuric acid (relative density 1.84) | 150~180g/L | 一 | |
| Nitric acid (relative density 1.42) | 一 | 250~300g/L | |
| Hydrofluoric acid (relative density 1.1) | 一 | 100~120g/L | |
| Monarchist | 40~50g/L | 一 | |
| Sodium Chloride | 10~20g/L | 一 | |
| Hydrochloric acid | 一 | 60~80g/L | |
| Temperature | 65~70°C | room temperature | |
| Time | 20~30min | 5~10min |
Formula 4: High Efficiency Stainless Steel Pickling Paste
| Mineral acid (nitric acid: hydrofluoric acid = 1:1) | 15.0％～30.0％ |
| Surfactant (Polyoxyethylene alkylphenol ether and castor oil ethylene oxide condensate) |
5.0% |
| Fillers (silica, etc.) | 20.0％ |
| Corrosion inhibitor (thiourea derivatives, polyoxyethylene xylenol ether, etc.) |
<0.5% |
| Water | Add to 100% |
First, dissolve inorganic acid in water, and then sequentially add surfactants, fillers and corrosion inhibitors. Stir and mix evenly to obtain the finished product.
This solution has stable performance, good adhesion, strong cleaning power, and is easy to store and transport. It is suitable for cleaning carbon scale, dust and grease on large stainless steel equipment such as reactors, heat exchangers and towers.
Formula 5: Spray Cleaner for Stainless Steel Tanks
Component A
| Sodium hydroxide | 38.0 copies |
| Sodium tripolyphosphate | 1.0 copies |
| sodium metasilicate | 10.0 copies |
| Sodium carbonate | 20.0 copies |
| Sodium lignosulfate | 1.0 copies |
| Sodium Phosphate | 20.0 copies |
| Polyoxyethylene octylphenol ether (mixture of E09-10 and E05) |
0.5 copies |
Component B
| Deodorized methyl ethyl ketone | 45.0 copies |
| Aromatic Naphtha | 20.5 copies |
| Linear alkylsulfonic acid | 10.0 copies |
| Sodium hydroxide | 2.5 copies |
| Hexanediol | 5.0 copies |
| Ethylene glycol monobutyl ether | 5.0 copies |
| Ethanolamine | 2.0 copies |
| Polyoxyethylene octylphenol ether (E09-10) | 5.0 copies |
| Water | 5.0 copies |
Mix Components A and B, add water to make a 6 to 38g/L cleaning solution.
This cleaner is used for spray washing stainless steel tanks and produces excellent results.
Formula 6: Aluminum and Stainless Steel Cleaner
| Phosphoric acid (85%) | 3％ |
| Citric acid | 4％ |
| Polyoxyethylene octylphenol ether (10) | two% |
| Butanone | 3％ |
| Water | 88% |
Slowly add acid to the water, then add butanone and a surfactant. If using cold water, pre-mix the surfactant with three parts warm water.
This solution is suitable for cleaning aluminum and stainless steel.
Formula 7: Stainless Steel Pickling Solution
| Hydrochloric acid | 25% |
| Nitric acid | 5％ |
| Sulfuric acid | 5％ |
| Water | 65% |
This formula is used to remove iron filings, oxide scale and rust stains from stainless steel. After pickling, the surface becomes brighter. The processing temperature is 50-60°C and the processing time is 30-60 minutes.
Formula 8: Stainless Steel Surface Oxide Cleaner
| Hydrogen peroxide (30%) | 1.5~5.0 copies |
| Hydrochloric acid (relative density 1.7) | 4.5~7.0 copies |
| Hydrofluoric acid (30%) | 1.0~5.0 copies |
The above components can be mixed with an added adhesive to form a viscous acid solution.
After this solution is applied to the stainless steel surface, it can dissolve any oxides formed on the surface, allowing the oxide to be removed.
The feature of this solution is that it is easy to use and does not require the addition of a pickling corrosion inhibitor.
Formula 9: Stainless Steel (I) Surface Oxide Film Remover
| Sulfuric acid | 5％～l0％ |
| Hydrofluoric acid | 2％～5％ |
| Water | Add to 100% |
Processing conditions: room temperature, 60-80 seconds.
Formula 10: Stainless Steel (II) Surface Oxide Film Remover
| ferric trichloride | 200~250g/L |
| Hydrochloric acid | l00~150g/L |
Processing conditions: room temperature, 90-150 seconds.
Formula 11: Remover of sintered material with soot on stainless steel surface oxide film.
| Nitric acid | 6％～8％ |
| Sulfuric acid | 8％～l0％ |
| Hydrofluoric acid | 4%~6% |
| Water | Add to 100% |
