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      Corrosion Evaluation of SAW Welded API 5L X-80 Joints in H2S-Containing Solution

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          Abstract

          The H2S corrosion resistance of API 5L X80 steel and its welded joint (WJ) were evaluated using the weight loss method in a 5%wt brine solution and different corrosive environments based on a sodium thiosulphate solution (10–3 and 10–2 mol/l). The weight loss method, scanning electron microscopy (SEM) and X-ray diffraction analysis (XRD) were applied to measure the effects of different H2S concentrations and pH (3 and 5) on the corrosion process and formation of corrosion product films. The results showed that the obtained corrosion rate and corrosion product films for both API 5L X80 steel and its submerged arc welding (SAW) WJ depend on the pH, H2S concentration and metal surface microstructural characteristics. The corrosion product film consists of two layers with different morphologies. The heat affected zone (HAZ) shows severe localized corrosion attack relative to the base metal (BM) and weld metal (WM), which is attributed to the microstructural characteristics of this region.

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          The influence of hydrogen sulfide on corrosion of iron under different conditions

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            Stuttering severity, psychosocial impact and lexical diversity as predictors of outcome for treatment of stuttering.

            This study assessed factors that predicted therapy outcome for children and adolescents who stuttered after attendance at an intensive therapy course. The factors examined were stuttering severity, lexical diversity measured by Type Token Ratio, and psychosocial impact of stuttering on the child's life. Fifty-four children who stuttered (CWS) participated in the study. The hypotheses were: (1) CWS with high initial stuttering severity would be more likely to persist than those with low initial severity; (2) lexical diversity before treatment should be related to therapy outcome; (3) psychosocial factors would affect therapy outcome. The predictions were assessed by linear and logistic regression analyses. Initial stuttering severity was the only significant predictor for stuttering severity after therapy. However, psychosocial impact correlated with improvement in fluency, and lexical diversity correlated with therapy outcome. Only initial stuttering severity was a significant predictor of therapy outcome after an intensive therapy intervention. This is in agreement with the study of Howell and Davis (2011). Readers will get an overview of the literature on risk factors that are considered to predict therapy outcomes for CWS. They will be able to (a) identify what variable represent potential risk factors, (b) describe the psychosocial impact of stuttering, (c) explain how lexical diversity is measured, and (d) describe different assessment instruments used to decide on the outcome of therapy. Copyright © 2012 Elsevier Inc. All rights reserved.
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              Effect of microstructure on the hydrogen trapping efficiency and hydrogen induced cracking of linepipe steel

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                mr
                Materials Research
                Mat. Res.
                ABM, ABC, ABPol (São Carlos )
                1980-5373
                April 2015
                : 18
                : 2
                : 417-426
                Affiliations
                [1 ] Pontíficia Universidade Católica do Rio de Janeiro Brasil
                [2 ] Universidade Federal do Rio de Janeiro Brazil
                Article
                S1516-14392015000200417
                10.1590/1516-1439.368714
                64ea1906-cea0-410a-97f4-06401ab1dd91

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1516-1439&lng=en
                Categories
                ENGINEERING, CHEMICAL
                MATERIALS SCIENCE, MULTIDISCIPLINARY
                METALLURGY & METALLURGICAL ENGINEERING

                General materials science,General engineering
                corrosion,H2S,steel,welded joint,localized attack
                General materials science, General engineering
                corrosion, H2S, steel, welded joint, localized attack

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