Autoclave was used to simulate the internal corrosion conditions of an oil and gas mixed pipeline,and the environmental applicability of three commonly used coatings were evaluated through appearance observation,insulation performance test,adhesion and wear resistance tests.Corrosion morphology observation,thickness and leak test were performed to evaluate the on-site wind-squeezing anti-corrosion process.The results showed that although the three coatings passed the conventional test such as acid resistance and alkali resistance before leaving the factory,they all showed various degrees of failure or performance degradation in the simulated pipeline internal corrosion environment.The construction process also had a great influence on the protective effect of the coating.In order to avoid similar situations during service,during designing internal corrosion protection for different working conditions,it is necessary to consider the suitability of the coating in service environment and strictly control the onsite construction process.%采用高温高压反应釜模拟某油气田混输管道内的腐蚀工况,通过表观形貌观察,绝缘性能测试,附着力及耐磨性测试,对三种常用涂层的环境适用性进行评价,并通过腐蚀形貌观察,厚度及漏点测试对现场风送挤涂防腐蚀工艺进行评价.结果表明:虽然三种涂层在出厂前均通过了耐酸性、耐碱性等常规测试,但在模拟管道内腐蚀环境中,涂层均表现出了失效或性能降低,现场施工工艺对于涂层的保护效果也有较大影响.为了避免涂层服役时发生类似情况,针对不同工况进行内防腐蚀设计时,需要重点考虑服役环境中涂层的适用性并严格控制现场的施工工艺.
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