1.What are the cleaning steps?
Preparation:
Personal Protective Equipment: Wear clean cotton gloves (to prevent leaving new fingerprints) and goggles.
Environmental Preparation: Conduct the procedure in a clean, dry, and well-ventilated area.
Cleaning Procedure:
Test: Gently wipe a small area, such as an edge or inconspicuous spot, with a soft cloth dampened with a small amount of solvent, and observe whether there are any changes in the surface (e.g., a change in gloss).
Subsequent protection:
For areas that need to be stored for a long period after cleaning, it is recommended to apply a thin, even layer of anti-rust oil (compatible with the original anti-rust oil, or consult the manufacturer).
2.What are the important points to note?
Do not use: Ordinary laundry detergent, soapy water, household dish soap, etc. These contain moisture and acidic/alkaline substances, which can easily cause rust and leave stubborn watermarks.
Use with caution: Gasoline (especially automotive gasoline containing impurities) and kerosene. These may contain gum or sulfides, which can leave residues after evaporation or affect some rust-preventive oils.
Avoid physical damage: Never use steel wool, abrasive scouring pads, or rough cloths to scrub, as these will severely scratch the smooth surface.
Act quickly: Clean fingerprints as soon as possible after they appear; the longer they remain, the higher the risk of oxidation and corrosion.
Large areas/Severe cases: If fingerprints have caused obvious oxidation (pale yellow, iridescent) or even minor rust spots on the surface, the above methods may only clean the grease. Rust spots require more professional treatment (such as polishing with very fine polishing compound), and the quality grade should be assessed.
3.What is the fundamental solution?
Strict operating procedures: Clean gloves must be worn when handling, inspecting, and processing cold-rolled coils (cotton-lined gloves with plastic or PU gloves on top are common practice).
Enhanced training and awareness: Ensure all employees handling bare coils understand the hazards of fingerprint contamination.
Improved warehouse management: Ensure a dry and clean storage environment, minimizing the exposure time of bare coils. Avoid physical contact during hoisting and loading.
Use specialized tools: Use clean wooden blocks and nylon slings to avoid direct contact between steel wire ropes and surfaces.
4.How to deal with light, fresh fingerprints?
Use high-purity alcohol or a special metal cleaner to gently wipe along the rolling direction and dry immediately.
5.How to deal with stubborn or oxidized fingerprints?
It is recommended to use solvent gasoline or isoalkane solvents, and more caution should be exercised during operation.