简介:摘要在钢管防腐生产过程中,喷丸处理是钢管表面处理的主要方法。一般要求处理后的钢基体表面除锈等级达到SA2.5。该工艺适用于环境条件较好的普通防腐等级和管道涂装。然而,在更严重的服务环境,如高温、高湿度和热环境,沼泽,河口岸和海底管道防腐涂料与某些水深在静水压力条件下,是不可能去除无机盐和有机污染物残留钢管表面深度仅靠喷丸加工和曝气技术。除尘等漂移材料的去除不可避免地会对防腐涂料的附着力产生负面影响。喷丸后的磷酸清洗工艺是消除钢管表面盐渣的一种有效方法。磷化清洗可以冲洗掉喷砂除锈后残留的氧化物和盐类,在钢管表面形成非常薄的磷化膜,可以提高镀层的附着力和阴极的抗剥离性能。
简介:摘要:反应堆压力容器主螺栓是连接容器法兰和顶盖的紧固件,对避免核放射性物质外逸,保证压力容器正常工作起着重要作用。为了避免主螺栓安装后不易拆卸的问题,并在一定程度上防止腐蚀,主螺栓精加工后需进行磷化处理。本文主要研究锰基磷化处理过程中酸洗和磷化工序对螺纹中径尺寸的影响规律,对螺纹中径加工公差的控制起到一定的指导意义。
简介:Dampingahybridsteppingmotorwithestimatedpositionandvelocity,Gridcurrentregulationofathree-phasevoltagesourceinverterwithanLCLinputfilter,TorsionalinteractionstudiesonpowersystemcompensatedbySSSCandfixedcapacitor,Amultivariablenewcontrolsolutionforincreasedlonglinesvoltagerestorationstabilityduringblackstartup,
简介:[篇名]Magneto-OpticalStudiesoftheCriticalStatesinc-axisOrientedMgB{sub}2ThinFilmandBulkMgB{sub}2/MgNano-Composites,[篇名]TheSoreteffectonconvectioninahorizontalporousdomainundercrosstemperatureandconcentrationgradients,[篇名]Improvingtheanti-seizureabilityofSiCsealinwaterwithRIEtexturing,[篇名]Coppernanoparticleswithinamorphousandcrystallinedielectricmatrices,[篇名]In-linelaserDopplervelocimeterusingfibre-opticBragggratinginterferometricfilters,[篇名]PreparationofaUV-attenuatingagentusingamechanochemicalreaction,[篇名]DesignofanAdaptiveObserverforSensorlessVectorControlofInductionMachinesunderRegeneratingConditions,[篇名]ConflictovernaturalresourcesamongpastoralistsinnorthernKenya:alookatrecentinitiativesinconflictresolution,[篇名]Releasingnitrogenfromammoniatedligninbywhiterotfunguscometabolizesenvironmentalpollutants,[篇名]Onanalogyanddissimilarityofdependenceofstabilityonseveralparametersinflowsimulations,[篇名]Ontheexponentialstabilityofaclassofnonlinearsystemsincludingdelayedperturbations,[篇名]6-indiameterInPsinglecrystalsgrownbythehot-wall,[篇名]Swing-upControlofaTranslationalInvertedPendulumHavingRestrictedTravel,[篇名]RobustPIDRate-BasedControlforPropagationDelayVariation,[篇名]Apracticalapproachforthedesignofmultivariablecontrolsystems,[篇名]Fibersensordetectslithium。