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Results
ABSTRACT: With the increasing number of vehicles in Mauritius and the severe environmental conditions on the island, under deposit corrosion and other types of corrosion problems in vehicles are commonly observed. This study was therefore performed to get a better insight into the factors affecting corrosion in vehicles, the parts of the vehicles prone to corrosion attacks, the types of corrosion attack observed, the reparation of the corroded parts and the way that Mauritians in general keep their vehicles in good running condition. The study was performed through surveys carried out among vehicle owners and major garages in Mauritius. The surveys consisted of questionnaires which were supplemented by field inspection. INTRODUCTION Mauritius is a tropical island of 1865 km2 which has high relative humidity level and rainfall. The corrosivity of the Mauritian atmosphere has been found to vary between category C3 and C4, according to ISO(1) 9223.1 Hence, the atmosphere can be detrimental to steel, especially in sheltered areas. One area in which steel is very commonly used, together with aluminium (but to a lower extent), is in the manufacture of bodies of vehicles such as cars, vans, lorries and buses. Due to the harsh outdoor conditions, involving excessive exposure to sunshine, rain and mud in which the vehicles need to operate, several studies were performed worldwide to get a better insight into the problem. A very extensive study on corrosion in cars performed by Ahmed and Al-Sulaiman in the coastal environment of the Dhahran/Damman region of Saudi Arabia showed that the roofs, bumpers, doors, bonnets and boots were the most affected parts.2 The majority of the cases, however, involved roofs, doors and bonnets. The age of the car was also an important factor affecting the frequency of the occurrence of corrosion damage.
- Africa > Mauritius (1.00)
- Asia > Middle East > Saudi Arabia > Eastern Province > Dhahran (0.24)
- Energy > Oil & Gas > Upstream (0.66)
- Automobiles & Trucks (0.57)
- Materials > Metals & Mining > Steel (0.49)
- Well Completion > Well Integrity > Subsurface corrosion (tubing, casing, completion equipment, conductor) (1.00)
- Production and Well Operations > Production Chemistry, Metallurgy and Biology > Corrosion inhibition and management (including H2S and CO2) (1.00)
- Facilities Design, Construction and Operation > Pipelines, Flowlines and Risers > Materials and corrosion (1.00)
ABSTRACT: Atmospheric corrosion tests have previously been performed in Mauritius through the outdoor exposure of low carbon steel. Results have shown that the corrosion degradation of the metal follows the bilogarithmic law except for the first three months of the atmospheric exposure. Further atmospheric corrosion tests were therefore performed for this very short term to analyze this period of atmospheric exposure. Low carbon steel was, therefore, exposed outdoors according to ISO 8565. They were removed after 1, 2 and 3 months of exposure in sets of three. The Weight Loss Method was used to determine the corrosion loss. The Point Counting Method was also used to determine the extent of the atmospheric corrosion attack in the first months of exposure. The Weight Loss Method showed that for the first three months the corrosion loss is linearly related to the time of exposure. The Point Counting Method, which is not commonly used in corrosion testing, showed that the surface degradation of the metal varies linearly with time of exposure, thus confirming the results of the Weight Loss Method. This type of behavior occurs, most probably, because the atmosphere attacks the metal directly at the start of the exposure period and this leads to a high rate of corrosion. INTRODUCTION Low carbon steel is increasingly used in Mauritius presently, especially in the construction industry. Several large steel buildings and structures are being erected in all regions of the island, as shown in Figure 1. Since the corrosivity of the Mauritian atmosphere has been found to vary between corrosion categories C3 and C4 according to ISO(1) 92231, atmospheric corrosion of carbon steel in the local atmosphere is becoming an important issue. Determining the trend for the first three months of exposure is quite challenging through the Weight Loss method.
- Africa > Mauritius (0.59)
- Europe (0.48)
- North America > United States > Texas (0.20)
ABSTRACT: The Mauritian textile industry is, nowadays, facing serious competition on the international market. With the aim of improving its productivity, corrosion has been identified as a major cost for the industry due to the huge amount of chemicals used in the dyehouses. The present study was therefore performed at one of the major dyehouses in Mauritius so as to identify the different types of corrosion occurring, the effect of the chemicals employed on the common metals used in the dyehouse and the cost of corrosion in the plant. The different types of corrosion occurring were assessed through visual inspection on the pipes, accessories and machines in the dyehouse. The effect of the chemicals on the common types of metals used was investigated through electrochemical tests using the Tafel technique. Three different types of metal and seven different types of chemicals were tested. It was found that low carbon steel had the highest corrosion rate among the metals tested and stainless steel UNS 31603 was the more corrosion resistant. Hydrochloric acid was the most corrosive fluid. The cost of corrosion over a yearly period was estimated to be $450,000 and this was 75% of the maintenance cost. INTRODUCTION The textile industry in Mauritius is a major pillar for the Mauritian economy and has been an engine of the economic growth over the past three decades. It started in the 1970s and it was meant to diversify the largely agro-based economy by encouraging the establishment of export-oriented textile companies. The Mauritian textile industry therefore has to improve its productivity so as to face the fierce competition on the international market. Corrosion presently costs much to the textile factories and, therefore, it has become important to analyse this problem so as to decrease its related costs.
- Africa > Mauritius (0.72)
- North America > United States > Texas (0.19)
- Well Completion > Well Integrity > Subsurface corrosion (tubing, casing, completion equipment, conductor) (1.00)
- Production and Well Operations > Production Chemistry, Metallurgy and Biology > Corrosion inhibition and management (including H2S and CO2) (1.00)
- Facilities Design, Construction and Operation > Pipelines, Flowlines and Risers > Materials and corrosion (1.00)