INVESTIGATION OF ALLOYING ADDITION IN SYNTHESIZING GALVANIZE STEEL BY DIP COATING
1. MATERIALS
1.1. PRE-TREATMENT
1.1.1. 1. GRINDING 2. CUTTING SAMPLE 11/12cm 3. DEGREASING WITH NaOH 4. RINSING WITH WATER 5. PICKLED IN SULFURIC ACID 6. RINSING WITH WATER 7. PRE-HEAT FLUX AT 80 DEGREE CELCIUS 8. SAMPLE OBSERVATION WITH OES
1.2. ELECTROPLATING
1.2.1. 1. ADDING WATER 60-70% 2. ADDING ETHYLENEDIAMINE 10-20% 3. ADD FORMIC ACID 1-10% 4. ADD COPPER SULFATE 20-30% 5. CONNECT POWER SUPPLY 17V 6. IMMERSE FOR 5-10 MINUTES
1.3. GALVANIZING
1.3.1. PURE ZINC
1.3.1.1. 1. GRAPHITE CRUCIBLE 2.0 LITERS 2. 1.4 LITERS Zn MOLTEN BATH 3. 9 cm * 2.5cm MILD STEEL
1.3.2. COPPER PRE-PLATE
1.3.2.1. 1. GRAPHITE CRUCIBLE 2.0 LITRES 2. 1.4 LITERS Zn MOLTEN BATH 3. 9 cm * 2.5cm PRE-COATED MILD STEEL
1.3.3. COPPER PRE-PLATE AND ALUMINIUM ADDITION
1.3.3.1. 1. GRAPHITE CRUCIBLE 2.0 LITERS 2. 1.4 LITERS OF 5% Al AND 95% Zn BATH 3. 9cm * 2.5cm PRE-COATED MILD STEEL
2. TEST
2.1. OXIDATION TEST
2.1.1. COMPARE OF THE WEIGHT BEFORE AND AFTER EXPOSE TO HIGH TEMPERATURE
2.2. SEM AND XRD
2.2.1. DETERMINING SURFACE MORPHOLOGY AND COMPOSITION OF DIFFERENT PHASES
2.2.1.1. ON THE SURFACE AND CROSS-SECTION OF THE COATING
2.3. HARDNESS
2.3.1. USING MICROHARDNESS TESTER ALONG CROSS-SECTION OF THE COATED LAYER
2.3.1.1. COMPARE WITH SIMILAR PHASE IN PURE ZINC COATING
2.4. CORROSION TEST
2.4.1. ELECTROPOLARIZATION TEST
2.4.1.1. SHORT-TERM MEASUREMENT
2.4.1.1.1. COMPARATIVE INFORMATION ON CORROSION RATES IN TERM OF MILLI-INCHES PER YEAR (mpy)
2.4.2. IMMERSION IN SIMULATION SEAWATER
2.4.2.1. THE IMMERSION IN ROOM TEMPERATURE AND CLOSED CONTAINER FOR 3 MONTHS
3. PROCESS
3.1. PRE-TREATMENT OF MATERIAL
3.1.1. ELECTROPLATING COPPER PRE-PLATE
3.1.1.1. DIP COATING-Zn-Al (GALFAN COATING)
3.1.1.1.1. XRD AND SEM TEST
3.1.1.1.2. HARDNESS TEST
3.1.1.2. DIP COATING-Zn
3.1.1.2.1. XRD AND SEM TEST
3.1.1.2.2. HARDNESS TEST
3.1.2. PURE Zn IMMERSION GALVANIZING
3.1.2.1. XRD AND SEM TEST
3.1.2.1.1. CORROSION TEST
3.1.2.1.2. OXIDATION TEST
4. PARAMETER
4.1. STRUCTURES
4.1.1. SPANGLE SIZE
4.1.1.1. SURFACE DENDRITIC ZINC CRYSTALS AT STAGE 3
4.1.1.1.1. INFLUENCES THE CORROSION RATE
4.1.2. COATING MICROSTRUCTURE
4.2. PROPERTIES
4.2.1. FORMABILITY
4.2.2. CORROSION RESISTANCE
4.3. DIPPING TIME
4.3.1. GIVE DIFFERENT COATING THICKNESS
4.3.1.1. 1.5s - 3.5s
4.3.1.2. 10s
4.4. TEMPERATURE
4.4.1. MELTING POINT Zn
4.4.1.1. 450 DEGREE CELCIUS
4.4.2. MELTING POINT Al
4.4.2.1. 660 DEGREE CELCIUS
4.4.3. MELTING POINT Cu
4.4.3.1. 1083 DEGREE CELCIUS
4.5. SIZE
4.5.1. 9cm LENGTH * 2.5cm WIDTH OF BASE METAL
4.6. WEIGHT
4.6.1. COMPARE IN THE DIFFERENCE OF WEIGHT INITIAL AND FINAL