Research on corrosion of steel structures in various marine environments is essential to assure the safety of structures and can effectively prolong their service life. In order to provide data for anticorrosion design of oil exploitation structures in the Bohai Bay, the corrosion behaviour and properties of steel in beach soil, using typical steel samples (Q235A carbon steel and API 5L × 52 pipeline steel) buried 0·5, 1·0 and 1·5 m deep under typical beach soils in Tanggu, Yangjiaogou, Xingcheng, Yingkou and Chengdao for 1-2 years were studied. The carbon steel and pipeline steel were both corroded severely in the beach soil, with the form of corrosion being mainly uniform with some localised attack (pitting corrosion). The corrosion rate of the carbon steel was up to 0·16 mm/year with a maximum penetration depth of 0·76 mm and that of the pipeline steel was up to 0·14 mm/year, with a maximum penetration depth of 0·53 mm. Compared with carbon steel, the pipeline steel generally had better corrosion resistance in most test beach soils. The corrosion rates and the maximum corrosion depths of carbon steel and pipeline steel were in the order: Tanggu>Xingcheng>Chengdao>Yingkou>Yangjiaogou with corrosion altering with depth of burial. The corrosion of steel in the beach soil involves a mixed mechanism with different degrees of soil aeration and microbial activity present. It is concluded that long term in situ plate laying experiments must be carried out to obtain data on steel corrosion in this beach soil environment so that the effective protection measures can be implemented.
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机译：研究钢结构在各种海洋环境中的腐蚀对于确保结构的安全性并有效延长其使用寿命至关重要。为了为渤海湾采油结构的防腐设计提供数据，使用典型的钢样（Q235A碳钢和API 5L×52管线钢）埋入0·5、1对海滩土壤中钢的腐蚀行为和性能进行了研究。研究了塘沽，羊角沟，兴城，营口和城岛典型海滩土壤下的·0和1·5m深度，为期1-2年。碳素钢和管道钢在海滩土壤中均受到严重腐蚀，腐蚀形式主要是均匀的，并有局部腐蚀（点蚀）。碳钢的腐蚀速率最高为0·16 mm /年，最大熔深为0·76 mm；管线钢的腐蚀速率最高为0·14 mm /年，最大熔深为0· 53毫米。与碳钢相比，管道钢在大多数测试海滩土壤中通常具有更好的耐腐蚀性。碳钢和管线钢的腐蚀速率和最大腐蚀深度依次为：塘沽>兴城>城岛>营口>羊角沟，腐蚀随埋藏深度的变化而变化。滩涂土壤中钢的腐蚀涉及一种混合机制，其中存在不同程度的土壤通气和微生物活性。结论是，必须进行长期的原位板铺设实验，以获取该滩土环境中钢腐蚀的数据，以便可以采取有效的保护措施。
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