Specimens

Pipe

Stainless steel type 304 (JIS G 3448): i.d. 13 mm (o.d. 15.88 mm × 0.8 mmt × 150 mmL)

Stainless steel type 304 (JIS G 3448): i.d. 25 mm (o.d. 25.58 mm × 1.0 mmt × 150 mmL)

Stainless steel type 304 (JIS G 3448): i.d. 50 mm (o.d. 48.50 mm × 1.2 mmt × 150 mmL)

Plate

Stainless steel type 304 (JIS G 4305): 30 × 50 × 8 mmt

Row water for test water

Service water (Miyoshi-machi Iruma-gun Saitama)

Analysis of samples

Microscopic examination, SEM, EDX, XPS

Test water

pH

6.0, 7.0, 7.6 (Preparated by CO₂ gas: 0.1 mL/min)

Cl-

16 mg/L (at Raw Water), 50 mg/L, 100 mg/L (Preparated by NaCl reagent)

Water temperature

25.0˚C

Deoxidation

Preparated by N2 gas

Measuring apparatus

Potentiostat (HZ5000: HOKUTO DENKO)

Sweep rate

10, 50, 100 mV/min

Measuring method

Potentiodynamic method (at anodic polarization)

Stirring rate

300 rpm

Number of run

n = 3