The effectiveness of unbonded polyethylene coatings, 0·20 mm in thickness, in protecting samples of iron immersed in cultures of sulphate-reducing bacteria has been studied. The corrosion (weight loss) rate was initially lower than that for uncoated controls, but later accelerated so that the weight loss after 12 weeks was about the same for coated and uncoated iron samples. The coatings were permeable to water and soluble sulphide, and underwent change in tensile strength during exposure to the bacterial cultures.
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