Techniques for corrosion monitoring

Lamb Wave Tomography and Its Application in Pipe Erosion/Corrosion Monitoring

Research in Nondestructive Evaluation ◽

10.1080/09349849608968114 ◽

1996 ◽

Vol 8 (1) ◽

pp. 189-197

Author(s):

J. Pei ◽

M. I. Yousuf ◽

F. L. Degertekin ◽

B. V. Honein ◽

B. T. Khuri-Yakub

Keyword(s):

Lamb Wave ◽

Corrosion Monitoring ◽

Erosion Corrosion ◽

Wave Tomography

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Corrosion monitoring and root cause identification in high solids concentrators

TAPPI Journal ◽

10.32964/tj15.7.467 ◽

2016 ◽

Vol 15 (7) ◽

pp. 467-477

Author(s):

PASI NIEMELAINEN ◽

MARTTI PULLIAINEN ◽

JARMO KAHALA ◽

SAMPO LUUKKAINEN

Keyword(s):

Paper Industry ◽

Black Liquor ◽

Construction Materials ◽

Open Circuit ◽

Process Conditions ◽

Potential Range ◽

Corrosion Monitoring ◽

General Corrosion ◽

High Solids ◽

Passive Area

Black liquor high solids (about 80%) concentrators have often been found to suffer from aggressive corrosion. In particular, the first and second effect bodies are susceptible to corrosion attacks resulting in tube leaks and wall thinning, which limit the availability and lifetime of evaporator lines. Corrosion dynamics and construction materials have been studied extensively within the pulp and paper industry to understand the corrosion process. However, it has been challenging to identify root causes for corrosion, which has limited proactive measures to minimize corrosion damage. Corrosion of the first phase concentrator was studied by defining the potential regions for passive area, stress corrosion cracking, pitting corrosion, and general corrosion. This was achieved by using a technique called polarization scan that reveals ranges for the passive area in which the equipment is naturally protected against corrosion. The open circuit potential, also known as corrosion potential, and linear polarization resistance of the metal were monitored online, which allowed for definition of corrosion risks for stainless steel 304L and duplex stainless steels 2205 and SAF 2906. An online temperature measurement added insight to the analysis. A process diagnostics tool was used to identify root causes of the corrosion attacks. Many of the root causes were related to process conditions triggering corrosion. Once the metal surface was activated, it was difficult to repassivate the metal naturally unless a sufficient potential range was reached.

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Corrosion monitoring of state of stainless steel surface in chloride solutions

Corrosion Materials Protection ◽

10.31044/1813-7016-2019-0-8-42-48 ◽

2019 ◽

pp. 42-48

Author(s):

A. N. Akhmetova ◽

◽

S. S. Vinogradova ◽

Keyword(s):

Stainless Steel ◽

Steel Surface ◽

Stainless Steel Surface ◽

Corrosion Monitoring ◽

Chloride Solutions

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Corrosion monitoring of metals

European Journal of Environmental and Civil engineering ◽

10.3166/ejece.15.633-647 ◽

2011 ◽

Vol 15 (4) ◽

pp. 633-647

Author(s):

Gonzalo E Gallo

Keyword(s):

Corrosion Monitoring

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Water treatment to reduce internal corrosion in the drinking water distribution system in Oslo

Water Science & Technology Water Supply ◽

10.2166/ws.2001.0056 ◽

2001 ◽

Vol 1 (3) ◽

pp. 91-96 ◽

Cited By ~ 1

Author(s):

L.J. Hem ◽

E.A. Vik ◽

A. Bjørnson-Langen

Keyword(s):

Water Treatment ◽

Corrosion Rate ◽

Distribution System ◽

Water Distribution ◽

Treatment Plant ◽

Water Treatment Plant ◽

Corrosion Monitoring ◽

Copper Corrosion ◽

Iron Corrosion ◽

Internal Corrosion

In 1995 the new Skullerud water treatment plant was put into operation. The new water treatment includes colour removal and corrosion control with an increase of pH, alkalinity and calcium concentration in addition to the old treatment, which included straining and chlorination only. Comparative measurements of internal corrosion were conducted before and after the installation of the new treatment plant. The effect of the new water treatment on the internal corrosion was approximately a 20% reduction in iron corrosion and a 70% reduction in copper corrosion. The heavy metals content in standing water was reduced by approximately 90%. A separate internal corrosion monitoring programme was conducted, studying the effects of other water qualities on the internal corrosion rate. Corrosion coupons were exposed to the different water qualities for nine months. The results showed that the best protection of iron was achieved with water supersaturated with calcium carbonate. Neither a high content of free carbon dioxide or the use of the corrosion inhibitor sodium silicate significantly reduced the iron corrosion rate compared to the present treated water quality. The copper corrosion rate was mainly related to the pH in the water.

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