{"id":4522,"date":"2026-07-08T15:09:15","date_gmt":"2026-07-08T08:09:15","guid":{"rendered":"https:\/\/dk-metalsurfacetreatment.com\/?p=4522"},"modified":"2026-08-27T10:51:01","modified_gmt":"2026-08-27T03:51:01","slug":"rust-removal-deoiling-hot-dip-galv","status":"publish","type":"post","link":"https:\/\/dk-metalsurfacetreatment.com\/en\/rust-removal-deoiling-hot-dip-galv\/","title":{"rendered":"Deoiling and rust removal in hot-dip galvanizing: two stages that determine the quality of the coating"},"content":{"rendered":"

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In the Hot Dip Galvanizing (HDG) process<\/strong>, many businesses often focus on controlling the temperature of the zinc tank, alloy composition or dipping time without properly assessing the role of surface pretreatment<\/strong>. In fact, this is the foundation that determines the adhesion of the zinc layer, the uniformity of the coating and the anti-corrosion effect of the product after plating, including rust removal.<\/p>\n

The two most important steps in the pre-treatment stage are Degreasing<\/strong> and Pickling<\/strong>. If the grease, dirt, or oxide layer is not completely removed, including during rust removal, the reaction between the molten steel and zinc will be hindered, resulting in many defects such as non-adhesive plating, air porosity, dull surfaces, or increased zinc consumption.<\/p>\n

Studies on hot-dip galvanizing technology have also shown that good control of the pretreatment process improves coating quality and significantly reduces the rate of product reprocessing.<\/p>\n

In \u00a0the Hot Dip Galvanizing (HDG) process<\/strong>, many businesses often focus on controlling the temperature of the zinc tank, alloy composition or dipping time without properly assessing the role of\u00a0 the surface pretreatment<\/strong>. In fact, this is the foundation that determines the adhesion of the zinc layer, the uniformity of the coating and the anti-corrosion effect of the product after plating, including rust removal.<\/p>\n

The two most important steps in the pre-treatment stage are Degreasing<\/strong> and Pickling<\/strong>. If the grease, dirt, or oxide layer is not completely removed, including during rust removal, the reaction between the molten steel and zinc will be hindered, resulting in many defects such as non-adhesive plating, air porosity, dull surfaces, or increased zinc consumption.<\/p>\n

Studies on hot-dip galvanizing technology have also shown that good control of the pretreatment process improves coating quality and significantly reduces the rate of product reprocessing.<\/p>\n

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