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（1） 目前国内外防腐层应用效果评价很好，对其使用中产生的缺陷报道的很少。报道的主要缺点有露点、剥离、阴极剥离、阴极保护屏蔽、剥离防腐层膜下腐蚀等，而且大部分有关缺陷的报道还停留在理论推测阶段，如资料中提到阴极保护屏蔽的问题，到目前还没有关于防腐层实际运作中出现阴极保护屏蔽的实例报道。经过多年的实践表明，随着使用年限的增加，出现缺陷最少的涂层系统是FBE/挤压聚乙烯3层结构防腐系统。【胜仓管业 高经理13730570531 QQ：2927372564】
（2） 通过对欧洲聚乙烯防腐层【胜仓管业 高经理13730570531 QQ：2927372564】30年应用史的回顾，虽然理论上剥离防腐层下会发生腐蚀或应力腐蚀开裂，但目前还没有发生剥离防腐层下出现膜下腐蚀或应力开裂的案例。在德国曼内斯曼研究所，曾经进行了长期的腐蚀实验室实验，以模拟防腐层应用效果。腐蚀实验环境有土壤、水、试验主要检查应力腐蚀开裂问题，其实验防腐是把有缺陷的聚乙烯防腐层钢管置于腐蚀条件和应力条件下，腐蚀环境为含有NaHCO3的沙土环境，温度70℃，管地电位-430~-460mV，钢管表面以不同方式预处理，【胜仓管业 高经理13730570531 QQ：2927372564】所有钢管均带压循环。实验结束，防腐层缺陷周围或多或少都有剥离，但剥离区为发现腐蚀。表面无氧气化皮的钢管为出现应力开裂，有氧化皮的钢管出现了开裂，裂纹最大深度0.2mm，可能是由应力腐蚀造成。由此得出结论，彻底的表面处理是防止应力开裂的有效手段。
（3） 陕京管道2003年开挖763m长管段，3PE防腐层共有破损点四个。由破损点的缺陷形式可以看出，防腐层的破损均是由硬物划伤所致。对3PE直管和冷弯管3个探坑检查，共检测17出剥离强度，其中5处剥离强度值低于70N/ cm，最小剥离强度120N/cm,最大剥离强度200 N/cm。产生原因为陕京管道是国内首次采用3PE涂敷技术，涂敷商的涂敷水平有限，对工艺工程的控制能立相对较差，可能导致个别管道的涂敷工艺设置不当造成防腐层的粘接力差。防腐层剥离强度低只是个别部位，而且只要防腐层无破损，也不会造成管道腐蚀。【胜仓管业 高经理13730570531 QQ：2927372564】
（4） 1999年和2003年对华北石油钢管厂露天存放的陕京焊接弯头管道剩余防腐管进行了抽测，其防腐的性能基本没有下降，尤其是华龙公司采用齐鲁聚乙烯生产的防腐管，存放6年后各项指标仍符合现行标准SY/T0413-2002规定，说明3PE防腐层确实具有优良的耐久和抗衰老性能。
Sina News, the reporter (Yang Editor) was inbed: [Shengcangguan Senior Manager 13730570531 QQ: 2927372564] 3PE corrosion-resistant steel pipe perbance testing, draw the following conclusions:
(1) At present, the application effect of anticorrosive coatings at home and abroad is well buated, and there are few reports about the defects in the application.【胜仓管业 高经理13730570531 QQ：2927372564】 The main shortcomings reported are dew point, stripping, cathodic stripping, cathodic protection shielding, stripping corrosion under the coating, etc. Most of the reports about the defects are still in the stage of theoretical speculation. For example, the problem of cathodic protection shielding is mentioned in the materials, so far no cathodic protection shield has been found in the actual operation of the coating. An example is reported. After years of practice, with the increase of service life, the coating system with the least defect is FBE / extruded polyethylene three-layer structure anticorrosion system.
(2) By reviewing the 30-year application history of European polyethylene anticorrosive coatings, although corrosion or stress corrosion cracking may occur in theory under peeling anticorrosive coatings, there are no cases of Subfilm corrosion or stress cracking under peeling anticorrosive coatings. A long-term corrosion laboratory experiment was carried out at the Mannesmann Institute in Germany to simulate the application effect of the coating. The corrosion test environment includes soil, water and test mainly to check the stress corrosion cracking problem. The experimental corrosion protection is to put the defective polyethylene coating steel pipe under the corrosion condition and stress condition. The corrosion environment is the sandy soil environment containing NaHCO3. The temperature is 70 C, the pipe ground potential is - 430 ~ - 460 mV. The surface of the steel pipe is pretreated in different ways. All steel pipes are packed under pressure. At the end of the experiment, the defects of the coating layer were more or less stripped around, but the stripping area was found to be corroded. The steel pipe with oxygen-free gasification skin app【胜仓管业 高经理13730570531 QQ：2927372564】ears stress cracking, and the steel pipe with oxide skin appears cracking. The maximum depth of cracking is 0.2 mm, which may be caused by stress corrosion. It is concluded that thorough surface treatment is an effective way to prevent stress cracking.
(3) Shanxi Jing pipeline excavated 763m long pipe section in 2003, and there were four breakage points in 3PE anticorrosion layer. From the defect b, it can be seen that the breakage of the anticorrosive coating is caused by scratching hard bs. A total of 17 peeling strengths were tested in three pits of 3PE straight pipe and cold bend pipe. The peeling strengths were below 70N/cm in 5 places, the minimum peeling strength was 120N/cm, and the maximum peeling strength was 200 N/cm. The reason is that the 3PE coating technology is first used in Shaanxi-Beijing pipeline in China. The coating level of the coater is limited and the control ability of the process engineering is relativ【胜仓管业 高经理13730570531 QQ：2927372564】ely poor, which may lead to poor adhesion of the anticorrosive coating caused by improper coating technology for individual pipelines. Low peeling strength of anticorrosive coating is only a few parts, and as long as the anticorrosive coating is not damaged, it will not cause pipeline corrosion.【胜仓管业 高经理13730570531 QQ：2927372564】
(4) Residual anticorrosion pipes of Shaanxi-Beijing welded elbow pipes stored in North China Petroleum Pipe Works in 1999 and 2003 were sampled and tested. The anticorrosion perbance of the remaining anticorrosion pipes basically did not decrease. Especially, the anticorrosion pipes produced by Hualong Company using Qilu polyethylene still meet the current standard SY/T0413-2002 after 6 years of storage. The E anticorrosion coating has excellent durability and anti-aging properties.
