Q:Do surface defects of galvanized steel affect corrosion resistance?
A:Corrosion resistance will be greatly reduced.
Missing plating, exposed iron, deep scratches: The damaged part of the zinc layer directly exposes the steel substrate. In a humid, salt spray or acid-base environment, iron and zinc form galvanic corrosion (zinc as anode and iron as cathode), causing the substrate to rust faster.
White rust diffusion: If the white rust (zinc hydroxide) on the surface of the zinc layer is not removed, it will gradually absorb carbon dioxide in the air to generate basic zinc carbonate, forming a loose and porous corrosion layer, destroying the dense protective effect of the zinc layer.
Q:What impact do surface defects of galvanized steel have on structural strength?
A:Severe plating leakage and coating peeling: Large-area zinc layer loss or peeling will destroy the stress distribution on the steel surface, especially when subjected to loads (such as tension and impact), the defects are likely to become stress concentration points, causing crack expansion.
Substrate defect mapping: If the steel itself has defects such as cracks and slag inclusions, the defects will be revealed through the zinc layer after galvanizing, and mechanical properties tests (such as tension and bending tests) are likely to fail at the defects.
Q:Will surface defects of galvanized steel affect its safety?
A:Consumer product hazards: If household galvanized products (such as furniture and kitchenware) have sharp edges, burrs or peeling coatings, they may cause scratches and cuts; if electrical parts are not plated properly, the metal may be exposed, increasing the risk of electric shock.
Special environmental risks: In flammable and explosive scenarios (such as the chemical and petroleum industries), if surface defects of galvanized parts cause sparks (such as metal debris generated by friction), they may become the cause of safety accidents.
Q:Will surface defects of galvanized steel affect its service life?
A:The service life will be greatly shortened and the maintenance cost will increase. Defective parts need to be repaired regularly (such as repainting and grinding zinc nodules), which increases the maintenance frequency and labor costs; serious defective parts (such as large-area plating leakage) need to be re-plated or scrapped, resulting in a waste of production costs.
Unaddressed defects will accelerate component failure and shorten the design service life.
Q:What are the costs of galvanized steel surface defects?
A:Surface defects in galvanized parts for decorative purposes (such as guardrails and home appliance panels) will directly affect the visual effect, leading to customer rejection or product downgrade, and damaging the company's brand image (such as rework of building decoration projects due to appearance defects).