FIELD: metallurgy.
SUBSTANCE: this invention relates to suppression of corrosion in underground structures, particularly, in buried oil pipelines. Suppression of corrosion in one area of long metal structure comprises applying HF electromagnetic signal to structure to generate voltage standing wave with corrosion suppression potential in required areas of the structure. Additionally, electromagnetic signal frequency is adjusted to create standing wave nodal point about required corrosion suppression area. Apparatus to this end comprises means for application of HF electromagnetic signal to structure generate voltage standing wave with corrosion suppression potential in required areas of the structure and means to adjust standing wave frequency for adjustment of standing wave length. Oil well riser is equipped with corrosion suppression apparatus.
EFFECT: higher efficiency.
11 cl, 2 dwg
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