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 | 10一20s | 30—60s |
| Ⅲ | Ⅳ | |
| Chromic anhydride | 70一100g／L | 100—150g／L |
| Sulfuric acid | 20—40g／L | 40—60g/L |
| Sodium chloride | 1～2g／L | 4—6g／L |
| Time | 2～10min | 5一10min |
After stainless steel is acid-etched to remove oxide scales, residual carbon ash can be eliminated using the above-mentioned chemical method.
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—280 mL／L | 140一150 mL／L |
| Phosphoric acid (relative density 1.70) | 一 | 100一120 mL／L |
| Temperature | room temperature | room temperature |
| Time | 5—10min | 5—10min |
Formula 3: Nickel-Chrome 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℃ |
| Time | l5～30min(Unblown sand) 1～3min(Sand blowing) | 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 | |
| Monarkite | 40～50g/L | 一 | |
| Sodium chloride | 10～20g／L | 一 | |
| Hydrochloric acid | 一 | 60～80g/L | |
| Temperature | 65～70℃ | 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 (Alkylphenol polyoxyethylene ether and Castor oil ethylene oxide condensate) | 5.0％ |
| Fillers (silica, etc.) | 20.0％ |
| Corrosion inhibitor (thiourea derivatives, Xylenol polyoxyethylene ether, etc.) | <0.5％ |
| Water | Add to 100% |
First, dissolve inorganic acid in water, 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 in large stainless steel equipment such as reactors, heat exchangers, and towers.
Formula 5: Stainless Steel Tank Spray Cleaner
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 |
| Octylphenol polyoxyethylene 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 alkyl sulfonic acid | 10.0 copies |
| Sodium hydroxide | 2.5 copies |
| Hexanediol | 5.0 copies |
| Ethylene glycol monobutyl ether | 5.0 copies |
| Ethanolamine | 2.0 copies |
| Octylphenol polyoxyethylene 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 yields excellent results.
Formula 6: Aluminum and Stainless Steel Cleaner
| Phosphoric acid (85%) | 3％ |
| Citric acid | 4％ |
| Octylphenol polyoxyethylene (10) ether | 2％ |
| Butanone | 3％ |
| Water | 88％ |
Slowly add acid to 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 scales, and rust spots from stainless steel. After pickling, the surface is 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 acidic solution.
After this solution is applied to the stainless steel surface, it can dissolve any oxides formed on the surface, enabling oxide removal.
The feature of this solution is that it’s easy to use and does not require the addition of a pickling corrosion inhibitor.
Formula 9: Stainless Steel Surface Oxide Film Remover (I)
| Sulfuric acid | 5％～l0％ |
| Hydrofluoric acid | 2％～5％ |
| Water | Add to 100% |
Processing conditions: room temperature, 60-80 seconds.
Formula 10: Stainless Steel Surface Oxide Film Remover (II)
| Ferric trichloride | 200～250g／L |
| Hydrochloric acid | l00～150g／L |
Processing conditions: room temperature, 90-150 seconds.
Formula 11: Remover for Sooty Sintered Material on Stainless Steel Surface Oxide Film.
| Nitric acid | 6％～8％ |
| Sulfuric acid | 8％～l0％ |
| Hydrofluoric acid | 4％～6％ |
| Water | Add to 100% |
