| Title | Geothermal Corrosion of Iron and Steel |
|---|---|
| Authors | Pound, B.G., G.A. Wright and R.M. Sharp |
| Year | 1980 |
| Conference | New Zealand Geothermal Workshop |
| Keywords | |
| Abstract | The corrosion of iron and carbon steel in geothermal condensates is being studied using electrochemical techniques. The anodic oxidation of iron in simulated geothermal condensates (deaerated)produces a black solid which has been identified by x-ray diffraction as the iron sulphide, mackinawite, The mackinawite readily spalls from the metal, giving rise to a steady corrosion rate with time of both iron and carbon steel in condensates. The cathodic process in these deaerated condensates occurs by the reduction of to The reduction mechanism involves adsorbed hydrogen atom intermediates which react to form hydrogen molecules. Potential step transients and impedance methods have been used to investigate the behaviour of the adsorbed hydrogen atoms. surface concentration of has been measured and it is shown that some of the adsorbed hydrogen dissolves in the metal. |