1.What are the typical applications of hot-dip galvanized pipes in the industrial field?
Chemical and petroleum industry: Pipeline systems used to transport acid/alkaline solutions (such as sulfuric acid and sodium hydroxide with a concentration of ≤10%), crude oil and natural gas, with strong resistance to chemical corrosion.
Marine engineering and shipbuilding: Ship deck guardrails, offshore platform brackets, port oil pipelines, etc., to resist salt spray and seawater corrosion.
Sewage treatment and municipal engineering: Aeration pipes and buried drainage pipes in sewage treatment plants, resistant to sulfide and microbial corrosion in sewage.
Heavy machinery and steel structures: Industrial plant steel columns, crane rails, mine brackets, etc., bear high loads and need to be exposed outdoors for a long time.
2.What are the typical applications of electrogalvanized pipes in industry?
Electronics and precision instruments: internal brackets of electronic equipment, instrumentation conduits, requiring beautiful surfaces and no zinc slag pollution.
Light industry and equipment manufacturing: furniture hardware (such as shelf steel pipes), agricultural machinery (such as irrigation pipes), small pressure vessels, cost-sensitive and mild corrosion environment.
Temporary facilities and non-critical components: temporary guardrails at construction sites, storage shelves, laboratory ventilation ducts, short-term use and no need for high corrosion resistance.
Automotive parts: in-vehicle structural parts (such as seat frames), non-exposed pipes, with coating process to improve composite protection.
3.Which galvanized pipe should be selected for high corrosion + high stress scenarios?
Hot-dip galvanizing is a must. The zinc-iron alloy layer of hot-dip galvanizing can resist crevice corrosion and stress corrosion cracking; ◦ Cathodic protection can repair coating damage (such as welding points) to avoid accelerated local corrosion.
4.How to choose high precision + low corrosion scenario?
Scenarios: Food processing equipment pipelines, medical cleanrooms, electronic equipment racks.
Reason: The surface of the electroplating layer is smooth (roughness Ra≤3.2μm), meeting the hygienic requirements;
No risk of zinc liquid residue, avoiding contamination of sensitive media (such as food, liquid medicine).
5.How to choose a composite protection scenario?
Scenarios: Strong acid/alkaline environments (such as lithium battery electrolyte transportation), high temperature vulcanization environments (such as steel smelters).
Solution: Hot-dip galvanized pipe as the bottom layer protection, covered with polyethylene (PE) or epoxy resin (EP) coating;
Composite protection can increase corrosion resistance by 3-5 times, and salt spray test > 10,000 hours.