Tungsten Copper Rod Corrosion Resistance

Introduction

Tungsten copper rod corrosion resistance is one of significant properties to evaluate tungsten copper products. It mainly refers to the chemical stability and depends on components, chemical properties and morphology.

Select

Air: Aluminum and its alloys, copper and its alloys, stainless steel;
Industry: Aluminum and its alloys, titanium and its alloys;
Seawater: Aluminum and its alloys, titanium and its alloys, copper and its alloys, nickel and its alloys, stainless steel;
H2SO4: High silicon iron, low concentrations use lead and high concentrations use Fe-C alloy;
HNO3: Titanium and its alloys, high silicon cast iron, low concentrations use stainless steel and high concentrations use lead;
HCl: High silicon cast iron, doped molybdenum high ferrosilicon, Hastelloy;
H3PO4: 18-8Mo stainless steel, lead and its alloys, high silicon cast iron, copper and its alloys;
CH3COOH: High silicon cast iron, 18-8Mo stainless steel, copper and bronze;
NaOH: Nickel and its alloys, high nickel cast iron, 18-8Mo stainless steel, copper and its alloys, titanium and its alloys;
Fluorine water: Fe-C alloys, high silicon cast iron, stainless steel, aluminum and its alloys, titanium and its alloys;
H2S: Titanium alloys, high silicon cast iron, 18-8Mo stainless steel, aluminum and its alloys;
Cl2: Titanium and its alloys, high silicon iron, Hastelloy.

Optimization

1. Improve the thermodynamic stability of tungsten copper alloy (increase electrode potential);
2. Reduce the anode activity:
a. Reduce the area of the anode region, enhance anodic polarization;
b. Add passive element to promote the passivation process;
c. For corrosion system can be passivated, if activated cathode elements added, such as Pd, Cu, Ni, Mo, etc. and typical metal elements, reducing the cathodic polarization, can significantly promote the alloy into the passive state;
3. Reduce the alloy cathode active phase of adaptation cathode control corrosion, non passivated metal:
a. Add hydrogen evolution over potential high alloying elements increase the hydrogen evolution over potential cathode;
b. Reducing alloy cathode area, improve the cathodic polarization;
4. Form the dense amorphous protective film on the surface of alloy, such as add Cu, P and alloy elements in steel.

copper tungsten rod photocopper tungsten rod photo

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