How to save the hot-dip galvanized square tube rainy season
Hot-dip galvanized tube summer storage precautions and return to alkali treatment:
Due to the hot-dip galvanized square tube, a layer of condensed water adhering to the surface of the hot-dip galvanized angle steel galvanized layer is treated with oxygen, carbon dioxide, hydrogen sulfide, sulfur dioxide, oxide, soot particles, dust, etc., and other chemical gases. , becomes a corrosive aqueous solution attached to the surface of the zinc layer to form an electrolyte, and the electrolyte is electrochemically corroded with a chemically unstable zinc layer, thereby producing a powder. Uncorrupted corrosion product ---- "white rust".
Hot-dip galvanized square tubes, hot-dip galvanized angle steel to prevent the production of "white rust" are:
1. When stacking, there shall be no condensed water on the surface of the galvanized steel pipe and there is still heat present;
2. Air circulation should be maintained in the warehouse, and the moisture content in the air should not be in the range of 60~95%;
3. Do not stack in places with harmful gases and dust;
4. Apply oil, passivation or organic coating to the surface of the galvanized layer.
The method of removing "white rust":
1. If you find that the color of “white rust”, you can wash it off in water, then dry the zinc layer with a towel, then brush it with a brush and a slurry of talcum powder and caustic soda. ;
2. If the color of “white rust” is grayish, use an aqueous solution of acid potassium tartrate and ammonium carbonate to brush the corrosion site, then wipe it off with a sponge soaked in calcium carbonate, rinse with water and dry.
Due to the hot-dip galvanized square tube, a layer of condensed water adhering to the surface of the hot-dip galvanized angle steel galvanized layer is treated with oxygen, carbon dioxide, hydrogen sulfide, sulfur dioxide, oxide, soot particles, dust, etc., and other chemical gases. , becomes a corrosive aqueous solution attached to the surface of the zinc layer to form an electrolyte, and the electrolyte is electrochemically corroded with a chemically unstable zinc layer, thereby producing a powder. Uncorrupted corrosion product ---- "white rust".
Hot-dip galvanized square tubes, hot-dip galvanized angle steel to prevent the production of "white rust" are:
1. When stacking, there shall be no condensed water on the surface of the galvanized steel pipe and there is still heat present;
2. Air circulation should be maintained in the warehouse, and the moisture content in the air should not be in the range of 60~95%;
3. Do not stack in places with harmful gases and dust;
4. Apply oil, passivation or organic coating to the surface of the galvanized layer.
The method of removing "white rust":
1. If you find that the color of “white rust”, you can wash it off in water, then dry the zinc layer with a towel, then brush it with a brush and a slurry of talcum powder and caustic soda. ;
2. If the color of “white rust” is grayish, use an aqueous solution of acid potassium tartrate and ammonium carbonate to brush the corrosion site, then wipe it off with a sponge soaked in calcium carbonate, rinse with water and dry.
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