Protection against Atmospheric Corrosion: Theories and Methods

Atmospheric corrosion is a common problem in the Gulf region in Saudi Arabia. Steel products produced locally have a problem of discoloration when stored in stockyards due to atmospheric corrosion. Corrosion inhibition of mild steel in the industrial and marine atmosphere of the Arabian Gulf region was investigated in this study. Sodium dihydrogen orthophosphate, dicyclohexylamine nitrite and sodium benzoate were used as inhibitors of the investigation. The three inhibitors were evaluated under atmospheric conditions by weight loss measurements and electrochemical techniques in a simulated solution of 2?0%NaCl and 1?0%Na 2 SO 4 . Sodium dihydrogen orthophosphate had the best performance among the three inhibitors. It was still effective at the end of 180 days of atmospheric exposure. The performances of dicyclohexylamine nitrite and sodium benzoate, on the other hand, were effective in the early stages of the atmospheric exposure (for y2 months). Their inhibition effectiveness deteriorated with further exposure to the atmosphere, being totally ineffective by the end of the exposure period.

Section: Weight Loss Measurement Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of atmospheric corrosion of mild steel after treatment by several inhibitor solutions

Malaibari¹,

Kahraman²,

Saricimen³

et al. 2007

“…Although some materials are exposed in the field environment for a long period of time, it is unpractical to accumulate the long-term corrosion loss data for every kind of material because the corrosion behaviour is sensitive to the material chemical composition. According to the observation of field exposure corrosion tests for various materials [10,11,[29][30][31], it is found that the long-term corrosion behaviour of metals undergoes three stages during the entire exposure period: the incubation, transition, and the steady -state periods [30]. During the first two stages, as the corrosion products accumulate on the metal surface, the corrosion rate decreases.…”

Section: Long-term Corrosion Loss Predictionmentioning

confidence: 99%

Application of hierarchical linear modelling to corrosion prediction in different atmospheric environments

Cai

Zhao

et al. 2019

Predicting the corrosion loss over time in different environments is challenging because the corrosion process develops over time and is influenced by multiple environmental factors simultaneously. Conventional regression analysis is not applicable because it has several limitations in dealing with multilevel structured data. In this paper, the hierarchical linear modelling method is employed instead. A two-level linear growth model is built to analyse the individual corrosion growth and the corrosion effects of the environment on carbon steel, zinc, and copper. Environmental factors that have important impact on the corrosion process are distinguished. By including the corrosion time and environmental factors as predictor variables, the model predictions are in good agreement with the experiments. The uncertainty of the corrosion data is quantitatively described and the confidence intervals are obtained. Then the long-term corrosion loss is predicted with power-linear corrosion kinetic model and corrosion-induced damage risks are analysed.

“…Corrosion in atmosphere accounts for more failures on a cost and tonnage basis than any other type of corrosion. Corrosion rate in an industrial and marine environment may be several times that in a rural region [4]. For example, corrosion of steel at the seacoast was found to be 400-500 times greater than in a desert area.…”

Section: Introductionmentioning

confidence: 99%

“…The surfaces of the components exposed to splash zone will exhibit wet and dry cycles. Conditions at the splash zone are generally more corrosive than at full immersion zone since in contrast to latter, the material is exposed only to a thin layer of water which can readily transport dissolved oxygen (DO) [4].…”

Section: Introductionmentioning

confidence: 99%

Corrosion study of SS304 and SS316 alloys in atmospheric, underground and seawater splash zone in the Arabian Gulf

Ul‐Hamid

Saricimen

Quddus

et al. 2017

Bare stainless steel type 304 and 316 alloys were exposed to atmospheric, underground and seawater splash conditions in order to evaluate their corrosion properties. The exposure was undertaken for 15 months at the coastal and industrial city of Jubail located in the Arabian Gulf. The corrosivity of the environment was determined by testing the soil, groundwater, seawater and air quality. Corrosion rate of the exposed coupons was determined by weight loss method. The experimental results indicate that the both types of stainless steels corroded moderately in this environment. Primary factors influencing the corrosion process are thought to be high degree of variation in temperature and humidity combined with high chloride and sulphate concentrations. The corrosion rate of stainless steel is also compared with those reported for other international locations.