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Hot-dip galvanizing听is a vital process for protecting seamless steel pipes听from corrosion, ensuring their longevity and durability in various applications. However, instances of leakage in galvanized coatings can undermine the effectiveness of this protective measure. Understanding the root causes of such leakage and implementing appropriate solutions are imperative for maintaining the integrity of galvanized steel pipes.

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Surface Contamination:

Issue: Contaminants like paint, grease, and soldering residues on the surface hinder the adhesion of the galvanized coating.

Solution: Thoroughly clean the surface through polishing or solvent scrubbing to remove impurities. For iron oxide presence, employ pickling to eradicate rust spots.

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Pickling Operations:

Problem: Inadequate or excessive pickling can lead to suboptimal outcomes. Under-pickling leaves rust spots, while over-pickling damages the steel substrate, hindering zinc adhesion.

Solution: Precisely control pickling duration to prevent under or overexposure. Ensure even distribution and frequent turning of parts during pickling to prevent accumulation and uneven treatment.

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Plating Process:

Challenge: Insufficient concentration of auxiliary agents or improper additive ratios can compromise the plating quality.

Resolution: Adjust the concentration of auxiliary agents to optimal levels and fine-tune the additive ratios for improved plating efficacy.

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Zinc Bath Composition and Operation:

Concern: Elevated aluminum content in the zinc solution or inadequate plating speed can result in leakage. Additionally, zinc immersion time and cleanliness of the zinc surface impact coating integrity.

Mitigation: Reduce aluminum content through zinc addition or ammonium chloride usage. Adjust plating speed appropriately to prevent thermal decomposition of auxiliary agents. Ensure thorough cleaning of zinc ash from the liquid surface to prevent overheating and leakage. Sprinkle ammonium chloride as a preventive measure during high-temperature gas escape.

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Material Considerations:

Issue: Presence of refractory oxides or excessive carbon in steel surfaces inhibits iron-zinc reaction, leading to inadequate coating adhesion.

Solution: Address refractory oxide presence through proper surface treatment methods. Monitor carbon content during steel production to prevent excessive iron carbide formation. Implement stringent quality control measures during material processing and forming to mitigate the risk of defects and subsequent leakage.