Hou Baorong

Electrochemical corrosion behavior of steel in the juncture area of sea clay and sand

Corrosion behavior of steel in the juncture area of sea clay and sand was studied. The results show that galvanic corrosion occurred between steel samples buried in sea clay and sand, and that the polarity of the galvanic cell reversed after some testing later. The cause of reversing of polarity is discussed.

Electrochemical evaluation of dissolution characteristics of Al-based sacrificial anodes in seawater

The surface dissolution characteristics of Al-based sacrificial anodes in seawater have never been expressed numerically except in words such as uniform dissolution, non-uniform dissolution, serious localized dissolution, etc. An electrochemical method was developed in our laboratory to evaluate the above mentioned characteristics quantitatively. The Al anode samples are polarized to −1000 mv (vs. Ag/AgCl reference electrode) in seawater at 25±1°C, and anodic current-time curves are recorded simultaneously. Then the coulometric density was calculated with the aid of a planimeter. By comparing the coulometric densities of these samples, the surface dissolution characteristics of anodes can be evaluated quantitatively.

Electro-connection marine corrosion test method and its application

Corrosion of marine steel constructions may vary to a considerable extent owing to their different locations such as atmosphere, splash zone, tidal zone, immersion zone and mud zone[7, 8]. A rather lengthy hanging steel sample is needed to test its corrosion resistance in various environments. But it is cumbersome to handle and not convenient for frequent observation and maintenance. So an indoor analogue test method is generally adopted for this purpose[1]. This paper is a report of such a test.

Effects of Bi and Ti on electrochemical property of Al-Zn-In sacrificial anode

The effect of trace elements Bi and Ti on the electrochemical property of aluminium sacrificial anode in seawater was studied. Different amounts of Bi and Ti were alloyed with Al-Zn-In to make 9 types of aluminium sacrificial anodes. Anode closed circuit potential, discharge capacities and current efficiencies were measured in the laboratory. The results show that the effect of Bi is greater than that of Ti.