Corrosion of iron in a chloride solution Creative Commons, Attribution alone (BY)
Authors: Jožef Stefan Institute
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Corrosion is one of the more destructive processes in nature, which is particularly pronounced, e.g. in salt water due to presence of NaCl. Salt water is among the more aggressive and most common corrosion media. To simulate the process, a 3.5% NaCl solution will be used as a corrosive medium, which is the average salinity of naturally occurring salt water. Corrosion takes place in two separate areas, where cathodic (reduction) and anode reaction (oxidation) takes place. In the anodic part, the metal dissolves, while on the cathode part hydroxide ions are formed in the reduction of water. Iron corrosion products can be stained with potassium hexacyanoferrate(III) K3[Fe(CN)6] x 3 H2O. In corrosion, iron ions are formed with potassium hexacyanoferrate(III), which form a coordination compound having a characteristic colour called Parisian blue. On the other hand, on the cathode side, the pH value locally increases due to the formation of hydroxide ions. Changing the pH value can be determined by adding a pH indicator, such as Phenolphthalein, which results in the change of the colourless solution into pink coloured.

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  45 min
Number of staff
Education Level
15-18 years
Science Discipline
Home use
Classroom use
Supervision required
Parent (legal guardian supervision required
Teacher supervision required
Knowledge prerequisites
Technical requirements
You'll need to buy some materials
Printed materials required
Installation effort
No installation required on typical computer

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