IMPROVED CORROSION RESISTANCE WHEN USING CHELATING AGENTS IN CHROMIUM-CONTAINING EQUIPMENT

摘要

The present invention relates to process to reduce the corrosion of equipment containing a chromium-containing alloy in the oil and/or gas industry, comprising a step of contacting the equipment based on a chromium-containing alloy with a solution containing at least 1 wt% on total weight of the solution of glutamic acid ?,?-diacetic acid or a salt thereof (GLDA) and/or methylglycine ?,?-diacetic acid or a salt thereof (MGDA) having an acidic pH, the use of the above solutions in equipment containing a chromium-containing alloy to reduce corrosion, and to a system containing a piece of equipment used in the oil and/or gas industry made at least partly from chromium-containing alloy in contact with an acidic solution containing at least 1 wt% of glutamic acid N,N-di acetic acid or a salt thereof (GLDA) and/or methylglycine N,N-di acetic acid or a salt thereof (MGDA).