1.What are the main hazards and underlying mechanisms of chemicals?
Direct Chemical Corrosion:
Acids, Alkalis, and Salts: Even minute amounts of splashes or volatiles coming into contact with the steel coil surface can directly damage the passivation layer, causing pitting, rust, or discoloration. Common examples include highly corrosive hydrochloric acid, sulfuric acid, sodium hydroxide, and sodium chloride (salt).
Oxidizing Agents: Agents such as chlorine and bleach accelerate the oxidation reaction of metals.
Electrochemical Corrosion:
When the steel coil surface adsorbs chemicals containing electrolytes (such as salts and acid mists), micro-batteries can form in humid environments, greatly accelerating the corrosion process.
Surface Contamination and Secondary Processing Defects:
Some chemicals (such as grease, organic solvents, and resin volatiles) may form difficult-to-remove oil films or adhesions on the surface, causing serious quality problems such as coating peeling and weld porosity during subsequent painting, welding, or electroplating.
2.What are the specific standards and requirements for chemical isolation?
Strict Zoning: Areas must be physically isolated from areas storing acids, alkalis, salts, solvents, greases, cleaning agents, and other chemicals, ideally within separate warehouses or buildings.
Volatile Gas Control: Operations that may generate corrosive gases (such as electroplating and pickling) are prohibited inside and around the warehouse.
3.How to control humidity?
Relative humidity: It is recommended to keep it below 50% for extended periods. A dehumidifier can be used, and the warehouse should be kept sealed.
High humidity acts as a catalyst for corrosion, and when combined with chemical pollutants, it can exacerbate the damage many times over.
4.How can we ensure cleanliness?
Dust and particle prevention: The warehouse should be sealed to prevent hard particles such as dust, coal ash, and sand from falling on the surface and causing indentations or scratches during subsequent processing.
5.What are some possible recommendations for warehousing operations?
Warehouse Location and Layout: The warehouse should be located in a high, dry area, upwind of pollution sources such as chemical plants, electroplating plants, and pickling workshops.
Incoming Inspection: Upon arrival of steel coils, inspect the packaging for damage, oil stains, or water stains. Isolate and handle any issues immediately.
Establish Management System: Clearly prohibit bringing any chemicals or unidentified liquids into the storage area. Establish a cleaning system, conducting regular cleaning, but avoid using wet mops or cleaning agents that may retain chemical residues.
Monitoring and Recording: Install temperature and humidity recorders in the warehouse to continuously monitor and record data for timely warnings and handling in case of environmental exceedances.
Emergency Preparedness: Develop contingency plans with clear isolation, reporting, and handling procedures in case of accidental chemical leaks or spills onto the steel coil area.