ZKW880 Corrosion Rate Measurer

The corrosion rate measurer adopts the method combining linear polarization, weak polarization and AC impedance to measure corrosion rate. For the polarization resistance technique, Stern formula is used to estimate corrosion current density Icorr.

Icorr=B/Rp

Based on polarization resistance measured by linear polarization technique, the polarization technique applies weak polarization to measured electrode, and Tafel constant can be calculated by the polarization current in the weak polarization region, and then the metal corrosion rate can be measured. Weak polarization technique not only eliminates substantial theoretical errors of linear polarization caused by Tafel constant estimation, but also eradicates damage to the electrode face caused by the application of the polarization curve method, i.e. Tafel line extrapolation method. AC impedance method is to apply weak high frequency sine wave signal to corrosion system. The high frequency signal can pass through the interface capacitance between metal and medium, and completely acts on dielectric resistance, and therefore the dielectric resistance of the system can be measured. The polarization resistance calculated by stationary linear polarization measurement minus the dielectric resistance is the actual polarization resistance of the corrosion system, and then the corrosion rate can be accurately measured.

Application Fields
·Applicable to fast measurement of corrosion rate in the industrial production site
·Research on assessment of laboratory metal corrosion rate
·Corrosion inhibitor screening, performance evaluation of water quality stabilizer and coatings, etc.
·Qualitative observation of corrosion trend and reaching a quantitative result

Technical Index
(1) Main Unit of Instrument:

Operating temperature	0-40 ℃
Relative humidity	≤80%RH
Measurement range of Ecorr	±800mV
Measurement range of corrosion rate	4×10-4～10mm/a (electrode area: 1cm2) 1×10-4～2.5mm/a (electrode area: 4cm2)
Measurement range of polarization resistance RP	20Ω～500KΩ
Measurement range of dielectric resistance RS	10Ω~100 KΩ
Single measurement time	2 min
Fixed-time automatic measurement interval	10—99 min
Data storage capacity	2000 Group
Measurement error compared with stimulation system	≤3%

(2) Standard Accessories Parameters:

Nylon electrochemical electrode holder	Technique specification
	Temperature-resistance	80 ℃
	Pressure resistance	Normal pressure
	Length	80 mm
	Material	Nylon
Cylindrical electrochemical electrode	Material	Carbon steel, stainless steel, brass, etc.
	Electrode area	4 cm2
	Female thread	M3

Configuration Information:

NO.	Name	Type	Qty.
1	Main unit of corrosion rate measurer	ZKW880	1
2	Nylon electrochemical electrode holder	ZKW820-M3-L80	2
3	Cylindrical electrochemical electrode	ZK8290- Material -S4	6
4	Checker	ZK8300/10K	1
5	Charger (12V-4A)	GY450	1
6	Power cords	GY570	1
7	Test leads	ZKW851	1
8	Communication line	ZKW852 (aviation plug to DB9 serial port )	1
9	Instruction manual	ZKW890	1
10	CD	ZKW891	1

Packing Description:

Equipment net weight:

Equipment gross weight:

Packing dimensions: 90×450×305 mm

Wrap: Cardboard boxes for outer packing and aluminum boxes for inner packing.