THERMODIFFUSION ZINC COATING Russian patent published in 2015 - IPC C23C10/36 

FIELD: oil and gas industry.

SUBSTANCE: thermodiffusion zinc coating of steel parts includes loading into a sealed rotating reactor steel parts and saturating mixture consisting of inert support, activator and 30 - 60 wt % of fine-grained zinc powder in quantity to weight of the loaded parts, heating of the reactor with parts and saturating mixture, withholding at 360-380°C in inert atmosphere and subsequent cooling down up to temperature of 20-36°C. Fine-grained powder is used with grain size of 4-60 mcm in quantity of 0.05-0.18 kg per 1m² of the coated surface of steel parts. Saturating mixture is loaded to the reactor in quantity of 40 - 100 wt % to the weight of parts while inert support is used with grain size of 60-140 mcm.

EFFECT: non-waste method of thermodiffusion zinc coating with simultaneous cheapening of the process.