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.
Предметом исследования является фосфатирующий состав «НОТЕХ». Это цинкфосфатный водный материал с неорганическими ингибиторами коррозии анодного типа, которые эффективно подавляют развитие подпленочной коррозии под слоем грунта. Механизм действия и исследования эффективности подавления коррозии фосфатирующего состава «НОТЕХ» проводилась с отечественными лакокрасочными материалами типа грунта ЭФ-065 и эмали ЭП-1236. Цель работы – обоснование системы покрытия с химической подготовкой поверхности под окраску. Предложена универсальная атмосферостойкая система лакокрасочного покрытия повышенной надежности и долговечности для защиты береговых металлических сооружений, конструкций и оборудования судостроительной верфи. Впервые методами кондуктометрии, рН-метрии и измерения адгезии показана совместимость «НОТЕХ» с алкидным грунтом Pilot QD Primer компании JOTUN и соответствие требованиям стандартов ISO по содержанию остаточных водорастворимых веществ перед окраской. При этом дополнительная обработка поверхности «НОТЕХ» после абразивоструйной очистки до степени Sa2,5 не ухудшает адгезию покрытия, а также допустима нестандартная операция преобразования продуктов вторичной (вспышечной) коррозии после очистки абразивом без их удаления. The subject of the study is the phosphating composition «НОТЕХ». It is a zinc phosphate aqueous material with inorganic anode-type corrosion inhibitors that effectively suppress the development of sub-film corrosion under a layer of soil. The mechanism of action and research on the effectiveness of corrosion suppression of the phosphating compound «НОТЕХ» was carried out with domestic paints and varnishes such as soil ЭФ-065 and enamel ЭП-1236. The purpose of the work is to substantiate a coating system with chemical surface preparation for painting. A universal weather-resistant paint and varnish coating system of increased reliability and durability for the protection of coastal metal structures, structures and equipment of a shipyard is proposed. For the first time, conductometry, pH and adhesion measurements have demonstrated the compatibility of «НОТЕХ» with JOTUN's Pilot QD Primer alkyd soil and compliance with ISO standards for residual water-soluble substances before painting. Moreover, additional processing of the «НОТЕХ» surface after abrasive blast cleaning to the degree of Sa2.5 does not impair the adhesion of the coating, and a non-standard operation of converting secondary (flash) corrosion products after abrasive cleaning without removing them is also acceptable.
A combined approach to paint was used to increase the effectiveness of anti-corrosion protection was used. In particular, passive insulating coating materials was modified with active additives. A water-soluble anodic inhibitor of atmospheric corrosion was encapsulated in a phosphate conversion coating NOTECH. As a result, the corrosion under a layer of paint primer was suppressed. It is important that phosphating does not create a layer like paint. So, such an approach is universal and compatible with most known types of paint coatings and can be combined with temporary protection (preservation). The second paint layer of the coating contained a water-oil-soluble corrosion inhibitor of the group “M”, namely: N-M-1. It is adduct of natural fat vegetable acids and cyclohexylamine. The data of corrosion tests and polarization curves are presented, which confirm the high protective properties of the proposed binary inhibitory anti-rust paint.
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