A Review on Galvanizing Coating Defects: Causes and Remedies

Hot-dip galvanizing is an efficient technique to control the corrosion of substrates. Producing blemish-free coatings a challenging task. Continuous work done on technology achieve excellent surfaces; thus, flaws are encountered at intervals in all continuous and galvannealed process. Most each very small galvanized defect can appear like draff particle, trapped actually tiny lot blemishes found hot-dipped coatings. Also, almost defects take place due roughed or mechanically dented surface, poor bath chemistry management, inadequate washing parts, less maintained apparatus. Thus, coated products, which manufactured by galvanizers, have develop excellence line instrument, heat treatment Zn sequence touching hard tough quality essential for automotive uses applications. This review paper first discusses different types coating defects, then Bare spot, Distortion, Dross, Touch marks, Dents, Rough Coating, Ash Deposit, Mechanical Damage, Blow out, Runs, Uncoated Ungalvanized Surface, Reactive Non-reactive steels welded together, Puddling suggests possible remedial measures be taken care; end, it summarize concluded.