Research Article
Evaluation of Corrosion Behavior of Galvanized Steel Treated with Conventional Conversion Coatings and a Chromate-Free Organic Inhibitor
Table 1
Some characteristics of the tested coatings.
| Coating | Chemical composition | pH | Application method |
| chromate | 200 g potassium dichromate + 6 cc sulphuric acid in 1 L of water | 0.8 | dipping for 20 sec at room temperature |
| phosphate | 21.0 g acidic zinc phosphate + 1.2 g sodium nitrite + 1.8 g triethanolamine oleate in 1 L of water | 5.0 | dipping for 600 sec at room temperature |
| inhibitor 5.0% | water-soluble corrosion inhibitor containing an alkanolamine salt of a polycarboxylic acid | 8.0 | dipping for 40 sec at 75°C |
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