Passivation of corrosion-resistant stainless Steel fasteners - ISO 16048
| pickling bath | ||||
| Type of steela |
chemicals | Concentrations in vol%c | Teplota c 掳C | Exposure time in a fresh bathc min |
| A2 A3 A4 A5 C3 b F1 |
HNO2 | 20 a啪 30 | 20 a啪 60 | 10 a啪 30 |
| H2SO4 | 8 till 11 | 60 till 80 |
5 till 30 |
|
| A1 C1 b C4 b |
HNO3 | 10 till 15 |
20 till 60 | 10 a啪 30 |
| h2so4 | 8 till 11 | 60 till 80 |
5 atill 30 |
|
| a Sort by steel ISO 3506-1, ISO 3506-2, ISO 3506-3 a ISO 3506-4 |
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| b Before pickling of steel connecting parts C1, C3 and C4, thermoformed must anneal to the softest soft annealed state and subsequently adjust the surface blasting, in order to reduce the risk of hydrogen embrittlement. 秘密研究所 made toughening C1, C3 and C4, hot-formed and polished, shot peening is permitted to modify only the starting material. | ||||
| c If necessary, the values permitted concentration acid, the temperature and exposure times outside these ranges. |
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| passivation bath | ||||
|---|---|---|---|---|
| Type of steela |
chemicals | Concentrations in volume % 0 | Temperature0 掳C | Typical exposure time c min |
| A2, A3, A4, A5 C1 F1 |
HNO3 | 20 till 50 |
20 till 40 |
10 till 30 |
| A1 C4 |
HN03 b | 25 till 35 |
15 a啪 40 |
|
| A1 | HNO3 + Na2Cr207 . 2H20 c | 15 till 25 |
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| C4 | HNO3 + Na2Cr207 . 2H20 c | 2 till 6 |
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| a Type of steel podle ISO 3506-1, ISO 3506-2, ISO 3506-3 a ISO 3506-4 b Use preferably the bath. C Allows the addition of Na2Cr207 . 2H20 to minimize staining or etching of high carbon a quick cutting of stainless steels. |
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| Passivation must be verified quality assurance system manufacturer. There is no known way of reference test method passivation. |
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