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The benefits of a novel approach to electrochemical pickling has been demonstrated in this project. Partners produced samples of four grades of high alloy steels in the form of heavy wall tube or as castings. The samples were all produced using normal commercial procedures, including were appropriate welding and heat treatment. Using these samples, it was shown that significant improvements can be obtained, as compared with conventional pickling. In particular, more rapid pickling in less environmentally hazardous electrolytes has been achieved.
Simple, relatively low cost, sulphuric acid has been shown to be the most suitable electrolyte for the enhanced pickling techniques developed for the selected steels. For example, tube material that can take 24 to 48 hours to pickle in a hydrofluoric acid based electrolyte have been pickled in times as short as 30 minutes in sulphuric acid based electrolyte. Similar spectacular improvements were obtained with the four basic grades of stainless steel examined in the form of both tube and castings.
The practical requirements for the effective pickling of a range of steels has been established. Successful pickling of a range of commercial quality heavy wall tube and castings has been demonstrated.
The pickling techniques developed during the course of the project are the subject of a patent application and will not therefore be described in detail. An exploitation agreement has been agreed by all Partners and is now in force. The project has made excellent progress. The results to date show that the enhanced pickling techniques developed should provide an economically attractive route to a more environmentally acceptable pickling progress. The prospect for commercial exploitation is believed to be very high.
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