ENVIRONMENTALLY BENIGN CORROSION INHIBITORS FOR INTERNAL PIPE CORROSION

摘要

Corrosion and deterioration of natural gas infrastructure, such as natural gasrnpipelines causes a major negative impact on the industry, both in operation costsrnand safety. Biocides to prevent microbial influenced corrosion (MIC) cost all ofrnAmerican industries billions of dollars annually. Many of the biocides are underrnregulatory scrutiny due to their toxicity to humans and the environment, so wernhave developed a number of potential biocides from natural sources such as plantsrnand animals. These environmental benign, “green” chemicals have proven to berneffective in killing a number of the microorganisms suspected of being therncausative agents in 30% or more corrosion events, as well as preventing theirrnattachment to pipe surfaces at lower concentrations. This microbial attachment isrna mandatory precursor of biofilm formation, which is the compulsory precursor ofrnMIC pitting of the metal. Minimal inhibitory concentrations and biofilmrnformation disruption was determined in both laboratory tests and pipelinernsimulating test loops using compounds isolated from peppers (species ofrnCapsicum) and a marine sponge. Results of these tests with sulfate-reducingrnbacteria, such as Desulfovibrio species were positive and extremely encouragingrnfor the development of novel and environmentally benign corrosion preventionrnproducts for addressing the gas industry corrosion problems.