Experimental Research On Ice Adhesion Strength Characteristics Of Marine Metal Surface

Under the cold weather conditions,when the ship is working at sea,the hull structure and the surface of ship equipment are easy to freeze,especially the deck,air inlet and outlet,communication equipment and other structures.Icing may not only cause damage to the hull structure and affect the use of ship equipment,but also affect the center of gravity of the ship due to the weight of icing itself,resulting in capsizing accidents.At present,the industry and universities have carried out a series of researchs on the theory and technology of anti icing and de icing,but the influencing factors in the freezing process of ice have not been fully analyzed.In order to reduce or solve the harm of ship ice adhesion,it is of great significance to deeply analyze the influences of different factors on ice adhesion strength.In this thesis,the characteristics of ice adhesion strength of Q235,6061 aluminum alloy and brass commonly used in ships are studied;the effects of metal surface temperature and ambient humidity on the tangential icing strength of commonly used metals in ships are investigated;At the same time,the influence of metal surface roughness on the tangential icing strength of metals commonly used in ships is studied.Finally,combined with the measuring cylinder and balance to complete the density measurement,the effects of ice shape and ice density on the tangential icing strength of metal are studied.The specific research contents are as follows.First of all,this thesis uses Q235 iron alloy,6061 aluminum alloy and brass as the samples for the metal surface experiment,and uses the tangential freezing strength to represent the ice adhesion strength,and deionized water is used for the adhesion experiments.At the same time,Surface cooling method and Simultaneous cooling method is used to explore the relationship between the metal surface temperature and the tangential icing strength.It is found that the tangential strength of metals measured by these two methods has the same trend of change with temperature,that is,the tangential icing strength increases from small to large from the initial temperature,reaches a maximum value at a certain temperature,and then decreases continuously as the temperature decreases.Secondly,starting from the influence of environmental humidity on the tangential strength of the metal surface,the influence of different environmental humidity on the ice adhesion strength under different surface temperatures is explored.The experiment finds that the humidity of 85% is the humidity condition for the maximum tangential icing strength of brass and 6061 aluminum alloy,and the tangential icing strength of these two metals increase first and then decrease with the increase of humidity,while The tangential icing strength of Q235 at each temperature under the condition of humidity 85% is less than the tangential icing strength under the same temperature in humidity 75% and 95%.Subsequently,metal samples with different surface roughnesses are obtained by treating the surfaces of Q235 iron alloy,6061 aluminum alloy and brass with sandpaper with different mesh numbers,and the tangential freezing strength of different metal rough surfaces at different temperatures is analyzed,and the effect of surface roughness on the ice adhesion of the commonly used metals in ships is obtained.It is found that the tangential icing strength of these metals increase first with the decrease of temperature,even at different roughnesses.and then decrease.Finally,this thesis combines the measuring cylinder and balance to complete the density measurement.Through the measurement,it is found that the density of ice increases first and then decreases with the decrease of temperature,which is consistent with the change trend of the ice tangential icing intensity measured above.Therefore,it can be concluded that the density change of ice can be within a certain range.To a certain extent,it shows the conclusion that the metal tangential icing strength changes.At the same time,by observing the morphology of the ice after freezing,it is found that the air bubbles inside the ice layer have a great influence on the density of the ice.