The article presents the waste generated during the production of hot-dip galvanizing. The analysis of the proposed methods of using these wastes in the production of zinc-containing coatings is carried out. It is shown that hard zinc can be successfully used in the compositions of saturating mixtures during thermal diffusion galvanizing of steel products and obtain high-quality coatings. The disadvantages include the need for grinding hard zinc.The dispersed waste of hot-dip galvanizing production, which is formed as a result of blowing pipes with superheated steam, can be used as a cheap substitute for expensive zinc powder in the compositions of zinc-filled paints. For paints, a fraction of 2–15 microns is used, which is 27 % of the total fractional composition. Therefore, in order to use a wider range of values of the fractional composition of dispersed waste to obtain zinc coatings and thus ensure the recycling of zinc into industrial circulation, the authors of this article plan to optimize and develop the compositions of powder compositions and the technology of thermal diffusion saturation of steel products based on zinc-containing waste.
It is established that inclusion of the modifier into the electrode coating allowed to change the grains of the weld metal from 20–60 to 10–30 mm, to change its morphology and to improve the welding-technological properties of the coated electrode. It is shown that the modifying additive introduced into the coating of a welding electrode containing ultrafine particles in an amount of 1% of the weight of the dry charge had not deteriorated the technological parameters during manufacture, and the integral index of the different thickness (Desp) of electrodes with standard and experimental coatings did not add to the accepted value of 0.05. This indicates that the quality of the lubricating mass, its properties, the stability of the mass flow from the spinneret are satisfactory for both batches.
A comparative analysis of the corrosion properties of zinc-containing coatings obtained on the basis of metallic powder zinc and dispersed hot-dip galvanized waste has been carried out. The results of a study of the corrosion resistance of zinc-containing coatings by the electrochemical method and in a salt spray chamber have shown that coatings obtained on the basis of dispersed hot-dip galvanized waste are not inferior in protective properties to coatings based on powder standard zinc.
The influence of the composition of saturating mixtures with standard zinc powder and zinc dust on the change in the size and weight of the samples was studied under laboratory conditions. It is shown that with an increase in the amount of the zinc component in the composition of the saturating mixture in the form of zinc powder (Znst) or hot‑dip galvanizing waste‑zinc dust (Znotx), the thickness of the galvanized product also increases. The obtained graphic dependences of the growth of the thickness of the samples on the amount of zinc components have the same pattern of change. It is also shown that with an increase in the zinc component in the composition of the saturating mixture in the form of zinc powder (Znst) or hot‑dip galvanizing waste – zinc dust (Znotx), the mass of the galvanized product also increases. The graphic dependences of the growth of their mass on the amount of different zinc components also have the same character of change.It has been established that the most intensive character of the growth in the values of the size and mass of the product is observed when the content of the zinc‑containing component in the mixture is more than 60 % for both saturating media, whether in the Znst‑Al2O3 or Znout‑Al2O3 medium. At the same time, products galvanized in a saturating Znst‑Al2O3 medium have large dimensions and masses.
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