What are the anti-corrosion treatment technologies for Precision Round Steel Bar

Electrolytic deposition (5–50µm chromium layer)

• Hardness: HV 800–1200
• Porosity: ≤1/cm² (80µm)
• Salt spray resistance: 3.5% concentration

Hydraulic piston rods, medical guide rails, marine components

• 30–50% cost savings vs thermal spraying
• Fully repairable surface
• Service life: 10+ years

Autocatalytic deposition (20–50µm Ni-P alloy)

• Hardness: HV 500–1100 (↑ to HV 1100 after 350℃/1hr)
• Corrosion resistance: >1000 hrs salt spray
• Amorphous structure for uniform protection

Food processing equipment, precision instruments, chemical environments

450°C zinc immersion (70–120µm Zn-Fe alloy layer)

• Salt spray resistance: >1500 hrs
• Cathodic protection for steel substrate

Thickness variance ±20µm may affect precision fits

Bridge components, outdoor structures, heavy-duty fasteners

Chemical oxidation forming 2–3µm Fe₃O₄ layer

• Cost: ~$0.7/meter
• Salt spray resistance: <24 hrs
• Requires supplemental rust-proof oil

General machinery components, fasteners, non-critical shafts

Zinc/Mn phosphate conversion (5–15µm layer)

• Enhances paint adhesion by 300%
• Salt spray resistance: 500 hrs (with sealant)
• Surface roughness increase: Ra +0.5–1µm

Automotive transmission parts, gear shafts, pre-paint treatment

500–580°C ammonia diffusion (0.1–0.5mm layer)

• Hardness: HV 900–1200
• Acid resistance: 80% better than chrome plating
• Max service temperature: 500°C

• Minimal distortion: <0.005mm/100mm
• No dimensional changes to base material

Aerospace components, servo motor shafts, high-wear environments

• 50µm chrome plating + K₂Cr₂O₇ sealing
• Forms Cr₂O₃ passivation film
• Porosity: <0.1/cm²

• Chemical nickel plating with PTFE impregnation
• Friction coefficient: μ=0.01
• 5× resistance to organic acids

Combines multiple protective mechanisms for extreme environments