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\documentclass{article}
\usepackage{tikz}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\begin{document}
  \begin{tikzpicture}
  \begin{axis}[
        xmin=-.1, xmax=1.8, xtick={0,.1,...,1.7}, 
        axis x line = middle,
  		axis y line = none,
  	]
  	\addplot[color=white,opacity=1]{.2};
  
  
  \end{axis}
  \end{tikzpicture}
\end{document}

\documentclass{article} 
\usepackage{pgfplots}% lädt auch tikz
\pgfplotsset{compat=newest} 
\begin{document} 
\begin{tikzpicture} 
  \begin{axis}[ 
    xmin=-.1, xmax=1.8,
    xtick={0,.1,...,1.7},
    xticklabel=\empty,
    extra x ticks={0,1,1.5},
    extra x tick label={\axisdefaultticklabel},
    extra x tick style={tick style={very thick}},
    axis x line = middle,
    axis y line = none,
    ymin=-.1,ymax=.1% gegebenfalls entfernen oder anpassen
  ] 
  \end{axis} 
\end{tikzpicture}
\end{document}