Abstract
In marine conditions, especially in the Arctic, the problems of reliability and safety of marine corrosion protection systems are relevant. Reliability can be enhanced by corrosion inhibitors. For the equipment not subject to painting, safe technologies for preservation of water-based compounds are substantiated by bioassay methods. When carrying out painting work carried out by crew members at sea, a simplified chemical surface preparation was proposed with the «NOTEH» phosphating compound with anode inhibitors. The topic of the discussion are the passivation properties of «NOTEH» according to the data on the suppression of corrosion under a layer of paint primer. To increase the safety of work, hexavalent chromium compounds were removed from the inhibiting block of «NOTEH» additives.
Highlights
Vulgaris Beijer test cultures were used as biosensors on Tamiya and Daphnia Magna Straus 5% culture medium
In order to assess the impact on the surrounding aquatic environment, we studied the degree of toxicity of aqueous solutions of inhibitors using biotesting methods, that is, using test objects that signal danger, regardless of which substances and in what combination cause changes in vital functions of the test objects
A comparative analysis of aqueous solutions of the following corrosion inhibitors was carried out in their working concentration of 1% of the mass: H-M-1 is a complex salt of a cyclic amine and natural plant fatty acids
Summary
The atmospheric corrosion inhibitors are the most advanced means of “temporary” protection and the main component of preservation compounds [1]. They may contain more toxic substances than the components of paints - nitrites, chromates, amine derivatives, etc. FMT - tall oil fatty acids modified with copper derivatives of chlorophyll [3]. It is insoluble in water, but forms a stable emulsion in an alkaline solution of sodium carbonate. Before the discharge of the wastes (solutions after deconservation) corrosion inhibitors N-M-1, FMT, Na2CO3, they must be diluted with water. For the purpose of preserving marine equipment for the period of storage, shutdown, repair, preference should be given to aqueous solutions of low-hazard N-M-1 and FMT
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