氟碳喷涂和粉末喷涂的区别肉眼可以分辨吗?

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金属表面涂装是一种保护金属免受氧化和腐蚀的方法。我们周围的腐蚀现象是指各种材料在环境（包括化学、电化学和一些物理因素）作用下的损伤、性能退化或状态退化金属表面涂装是金属防腐的重要手段良好的喷涂保护层可以作为防止腐蚀性介质侵入的屏障。
重要性
由于腐蚀是一个不可逆的自发过程，即使是优质的油漆涂层保留层也很难保护金属不受腐蚀，特别是当金属表面的油漆涂层没有很好地结合、损坏，或有针孔、气泡、裂纹、剥落等缺陷时涂料的防护效果会大大降低，甚至导致金属腐蚀的恶化因此，有必要对涂装过程中金属腐蚀的因素进行分析，并采取有效的对策。
涂装金属的腐蚀机理
一般来说，金属腐蚀是多种因素综合作用的结果，其中一些因素在腐蚀过程中起着重要作用金属表面被涂成涂层保护层，金属腐蚀的区域是涂层膜与金属表面的界面区域，腐蚀扩展到金属基体的深度。
如果金属表面的漆层能有效地隔离水、氧、电子、杂散离子等的渗透，就能大大减缓或避免被漆金属的腐蚀如果隔离效果不好，则在金属上的涂料保留层的防腐和防腐保护效果不好生产实践表明，保护涂层对水的渗透性严重影响金属涂装表面的附着力，而氧的渗透性对金属的腐蚀性能影响很大涂装金属的腐蚀形式多种多样，但腐蚀的根本原因与化学和电化学作用密切相关。
金属料等因素的影响
涂装金属的腐蚀与金属材料本身的耐腐蚀性密切相关用于喷漆的金属有钢、铝、铜或镁毫无疑问，金属漆的耐腐蚀性和耐腐蚀性是不同的由于金属材料表面状态的不同，涂装后涂层的防腐和防腐效果明显不同例如，经喷砂净化处理的钢板件和同一牌号自然腐蚀的钢板件采用同一油漆进行保护由于腐蚀的不利影响，自然腐蚀的钢板零件的腐蚀速率比喷砂处理的钢板零件高几十倍，其腐蚀防护效果明显低于喷砂处理的钢板零件金属表面的缺陷，如夹杂物、微裂纹、应力等，以及大气中水分和活性离子（Cl-、Br-）的吸附，都会在不同程度上影响甚至加速油漆金属的腐蚀。

Metal surface painting is a way to protect metal from oxidation and corrosion. The corrosion phenomenon around us refers to the damage, performance degradation or state degradation of all kinds of materials under the action of environment (including chemical, electrochemical and a number of physical factors). Painting on metal surface is a very important means of metal corrosion protection. A good protective layer of spray painting can be a barrier to prevent the invasion of corrosive medium.

Importance
As corrosion is an irreversible spontaneous process, even the high-quality paint coating retention layer is difficult to protect the metal from corrosion, especially when the paint coating layer on the metal surface is not well combined, damaged, or has pinholes, blisters, cracks, peeling and other defects, the protective effect of the paint coating will be greatly reduced, and even lead to the deterioration of metal corrosion. Therefore, it is necessary to analyze the factors of metal corrosion in painting and take effective countermeasures.
Corrosion mechanism of painting metal
Generally speaking, metal corrosion is the result of many factors, and some of them play an important role in the process of corrosion. The metal surface is painted to form a coating protective layer, and the area where the metal corrodes is the interface area between the coating film and the metal surface, and the corrosion expands to the depth of the metal matrix.
If the paint coating layer on the metal surface can effectively isolate the penetration of water, oxygen, electrons, stray ions, etc., it can greatly slow down or avoid the corrosion of the painted metal. If the isolation effect is not good, the anticorrosion and anti-corrosion protection effect of the paint retention layer on the metal is not good. The production practice shows that the permeability of the protective coating to water seriously affects the adhesion of the metal painting surface, while the permeability of oxygen greatly affects the corrosion performance of the metal. There are many kinds of corrosion forms of painting metal, but the root cause of corrosion is closely related to the chemical and electrochemical effects.
Influence of metal material and other factors
The corrosion of painting metal is closely related to the corrosion resistance of metal material itself. The metals used for painting are steel, aluminum, copper or magnesium. There is no doubt that the corrosion resistance and corrosion resistance of metal painting are different. For the difference of surface state of metal materials, the effect of anti-corrosion and anti-corrosion protection of the coating is obviously different after painting. For example, the steel plate parts treated by sandblasting and purification and the steel plate parts of the same brand with natural corrosion are protected by the same painting. Due to the adverse effect of corrosion, the corrosion rate of the steel plate parts with natural corrosion is dozens of times higher than that of the steel plate parts treated by sandblasting, and the corrosion protection effect is significantly lower than that of the latter. Defects on the metal surface, such as inclusions, microcracks, stresses, etc., and adsorption of moisture and active ions (Cl -, Br -, etc.) in the atmosphere will affect or even accelerate the corrosion of painting metal to varying degrees.