Quality of Metal Surface After Hydroabrasive Cleaning from Corrosive Deposits

Abstract

A brief analytical review of existing hydraulic methods and techniques used to remove corrosive deposits formed on metal surfaces is provided. An effective cleaning method is described – hydro-abrasive cleaning (HAC) using bentonite clay, soda ash and polyacrylamide in its composition, which can not only improve the quality of the surface being cleaned, but also form a corrosion-protective film coating on it. The results of experimental research to study the influence of hydroabrasive cleaning technology parameters on the processed surface of samples made from steels Ст3 (St3), Ст20 (St20) and Ст45 (St45) are presented. It has been shown that changing the parameters of hydro-abrasive cleaning (jet speed, distance to the treated surface, time) makes it possible to achieve a roughness of metal products ranging from 3.2 μm to 12.5 μm. It has been established that the use of a new technology of hydro-abrasive cleaning (HAC) results in the removal of corrosive deposits from metal surfaces with a minimum roughness of up to 0.01 microns. It has also been shown that with a bentonite clay content of 2–4 %, it is possible to achieve surface roughness in the range of 20–30 μm, which is optimal for the flame spraying process. With a bentonite clay content of 0.5–2 %, a surface roughness of 30–50 μm can be achieved, which is optimal for the subsequent painting process. In addition, when carrying out hydro-abrasive cleaning (HAC) on the treated metal surfaces, a long-term anti-corrosion coating is formed, which retains its properties for a long time (up to 1 year).